OK - thought I'd start a new thread on this so as to catch all the attention of all LLY owners. Here's the info........

Trek5200 provided the following information concerning a fix for the LLY droan / moan / resonance / vibration sound at 1700 RPM's (55-63 MPH) that seems to be effecting some LLY owners. It was posted on this related thread HERE (http://dieselplace.com/forum/showthread.php?t=22802&page=6&pp=10)

I want to share what they did to find the problem from my work order:

customer states humming type noise from engine when driving and at idle approx. 1700rpm. checked mounting around engine area, repositioned ground strap at master cyl away from fuel line disconnectors. test drove, noise still present. removed serp belt and started vehicle, sounded better retorqued all acce. mounting bolts and checked p/s pump movement for pulley, ok fluid is clear, no contamination noted. checked idler bearings, ok. tensioner is good,installed belt and removed the fan and clutch assy, noise is better. removed stock unit fan and clutch and installed on this vehicle, drove vehicle approx. 2 miles noise still present. road tested with field tech. advised poss induction noise. removed induction plastic and drove. noise present. downloaded updated software to pcm for noise issue at 1700 to 1800 rpm, noise present.
reinstalled all air induction system and original equipment further checking found noise from exhaust has doc. information for noise. mounted/welded 2 weights in front of converter forward at bend. test drove to verify noise is now gone.

Here are the part numbers that were used:
qty number description
2 10199232 dampner A 3.704
1 ZP5000 pick-up diff.

I took my '05 into the dealer this week and showed them a copy of the info Trek5200 had provided. They did the fix and I got my truck back today. I must say it is MUCH quieter. Now there is only a little resonance noise at 1700 RPM's or the 55 - 63 MPH range. Very much more accepatable noise llevels IMHO! There was a slight delay during my fix because they had to order the dampner part. But when that came in, the clamp was not included. So, that had to be reordered. The 3 below pics are what they did. Looks like they welded the dampner weights to the clamp before securing everything. Very neat / out-of-the-way install. Also there is no longer any vibration being felt through the steering wheel and accelerator pedal (which I though was normal until it went away). My new truck feels like a new truck :)

On a side note: They also replaced the intermediate shaft and no more clunk! It steers much more easily now. Also the alignment was off from the factory.

Hope this helps!

Rob

Skoryaro,
I'm glad my information was able to help. The work done on your truck is very close to mine. The only difference is mine was not done with clamps, but welded on the pipe. Excellent pictures, that I couldn't provide. "WAY TO GO!"

BTW -obviously the repair was covered under warranty. The noise was described as "unacceptable"

Skoryaro,
I'm glad my information was able to help. The work done on your truck is very close to mine. The only difference is mine was not done with clamps, but welded on the pipe. Excellent pictures, that I couldn't provide. "WAY TO GO!"

Yea - the dealer asked me if I wanted them to weld it on or clamp it on so that it could be removed if I changed the exhaust. I thought that was a good reason to clamp it only.

I have already changed my exhaust.Will that affect what they can do under warranty?

I have already changed my exhaust.Will that affect what they can do under warranty?

My guess is that you would be hard-pressed to get a dealer to install a warranty item on a non-OEM part. Let alone proving the noise existed on the original exhaust. If you only did a CAT back exhaust where the down pipe is still OEM you may have better chances.

Same noise vibration on my 03 1500 SS - I'm not sure it's a diesel thing

Same noise vibration on my 03 1500 SS - I'm not sure it's a diesel thing
I know that this has been the fix for many a gas engines in the past. That's why they are making the parts.

Trek 5200,Skoryaro2,

Awesome work guys! This is why this forum is so great!
Thanks for the posts and the Pics! This fix will undoubtably be used by many.
Who knows, maybe even somebody from GM will take note.........

Does anybody know if those weights are a GM part? I'd like to make my own and install it.

Does anybody know if those weights are a GM part? I'd like to make my own and install it.

Yep, here's the GM part # from Trek5200's post. I don't have all my paperwork back from the dealer yet, but I THINK they are about $60.......somone in the know will chime in though.

10199232 dampner A 3.704 (you need 2)

Maybe Trek5200 has the cost listed on his invoice??

I have made a few of those for Yukons but not yet for a Duramax truck.

Yep, here's the GM part # from Trek5200's post. I don't have all my paperwork back from the dealer yet, but I THINK they are about $60.......somone in the know will chime in though.

10199232 dampner A 3.704 (you need 2)

Maybe Trek5200 has the cost listed on his invoice??Sorry guys, since my work was warranty there was no pricing listed.

The current list price is $47.57 ea

The current list price is $47.57 ea
Yikes! Looks like about $100 + clamp. Wonder if any of our vendors have anything similar?

Is it mounted just after the actual down pipe (on the front pipe)? I haven't crawled under mine to find the reference spots shown in the pictures. (good job on the pictures, though! - thanks)

Is it mounted just after the actual down pipe (on the front pipe)? I haven't crawled under mine to find the reference spots shown in the pictures. (good job on the pictures, though! - thanks)
Infront of the CAT, forward of the bend that is in the pipe.

I have the same noise and vibration that you had. The noise isn't that bad but the vibration drives me crazy. How would that dampner fix the vibration? Mine almost feels like a unbalanced wheel or a driveshaft on its way out. Is this the same vib? Mine is most noticable at the 50-60 mph range.

I am not sure about getting my dealer to fix this...but if this fix works I might have to come up with my own fix for my problem.

Is there something special about those dampers or could one just weld/clamp any weighted mass and achieve the same results? How much do those dampers weigh?

I have the same noise and vibration that you had. The noise isn't that bad but the vibration drives me crazy. How would that dampner fix the vibration? Mine almost feels like a unbalanced wheel or a driveshaft on its way out. Is this the same vib? Mine is most noticable at the 50-60 mph range.

I am not sure about getting my dealer to fix this...but if this fix works I might have to come up with my own fix for my problem.Whity,
Mine was noticeable at 35mph with little noise, but more louder as I reach 55-60mph. I thought it was my 4x4 ingaging. Also, check your rpm's when the noise starts to develope. The way I gather is that the weights keep the pipe inplace from flexing which developes the droan. Print out a copy of my work order of thread 1 and take it to your dealer. :ro)

does anybody have the problem with a after market exh.4in with down pipe minus cat

btw i have my old exh. system complete. if problem arises i will reinstall my factory exhaust, take to the dealer,show then the repair sheet , have then install the dampner(clamp it) ,remove it then reinstall mbrp down pipe and cat back system.clamp the dampner on and try it

Is there something special about those dampers or could one just weld/clamp any weighted mass and achieve the same results? How much do those dampers weigh?
I called my service manager and he said there is nothing special about the dampeners, it is just adding mass. So made mine look just like the pictures that skoryaro2 posted. I used 1 1/2 inch solid shaft about 4 inches long and welded it all together just like the pictures. I would say it has definitely helped<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

I called my service manager and he said there is nothing special about the dampeners, it is just adding mass. So made mine look just like the pictures that skoryaro2 posted. I used 1 1/2 inch solid shaft about 4 inches long and welded it all together just like the pictures. I would say it has definitely helped<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

After a few miles under my belt since the fix, I'd have to say that my droan noise is about 75% gone after installing this mod.

In an attempt to make it 100% gone, I'm thinking about moving the dealer installed dampner forward a little bit and adding a second weight behind it made from similar items that DMAXHD used as stated above.

Do you think it will do any good or is it just overkill?

Anyone know what size muffler clamp would work (3 1/2"?)and where they might be available?

After a few miles under my belt since the fix, I'd have to say that my droan noise is about 75% gone after installing this mod.

In an attempt to make it 100% gone, I'm thinking about moving the dealer installed dampner forward a little bit and adding a second weight behind it made from similar items that DMAXHD used as stated above.

Do you think it will do any good or is it just overkill?

Anyone know what size muffler clamp would work (3 1/2"?)and where they might be available?
skoryaro2
The muffler clamp you need is 3 1/2 inch. I bought a couple clamps at a Tractor Supply Company. I tried Auto zone and they only went to 3 inch.

As for overkill; it wouldn't hurt to try it. I would agree about the percentages that you used. My droan is not completely gone but much better

Is anyone having this problem with a LB7 downpipe or an aftermarket 4 inch. downpipe?

Is anyone having this problem with a LB7 downpipe or an aftermarket 4 inch. downpipe?

There's been some discussion here that indicates those that did a "CAT back" exhaust upgrade only still had the same noise.

I agree, would be nice to hear input from somone who did the LB7 downpipe upgrade though.

my dad's old 6 liter gas motor would do the same thing when you stomped on it from a stop with a load on it. it would actually make the gas cap bounce on the rubber pieces some times. that was only on take off though and seemed to disapear after the second gear.

Is there something special about those dampers or could one just weld/clamp any weighted mass and achieve the same results? How much do those dampers weigh?
FYI, I bought a couple of the GM dampners and made a unit very similar to the one shown in the Pics posted here. The GM dampners are not solid, they are filled with what sounds like BB's when you shake them. I would say they weigh a couple of Lbs. each.

gm prts direct has the dampers for 27 each plus their freight. 47 retail
dmaxallitech might be able to get these

for two gmpartsdirect charges 65.06 delivered part *10199232

Still no input from you LB7 or aftermarket downpipe users??????

FYI, I bought a couple of the GM dampners and made a unit very similar to the one shown in the Pics posted here. The GM dampners are not solid, they are filled with what sounds like BB's when you shake them. I would say they weigh a couple of Lbs. each.

I'm guessing that the reason that they are filled with BB's rather than being solid is that the resonance sound waves would be absorbed better when traveling through the BB's due to the additional air space present.

I'm thinking of making mine out of a hollow pipe, filled with a similar material and capped on both ends. Thought about using copper pipe, but that will probably look awful in a short time and be too soft. Looking into using steel / black gas line pipe filled with metal shavings / dust from a manufacturing shop.

I'm trying to get my cost down to around $10.00 :)

...

I'm thinking of making mine out of a hollow pipe, filled with a similar material and capped on both ends. Thought about using copper pipe, but that will probably look awful in a short time and be too soft. Looking into using steel / black gas line pipe filled with metal shavings / dust from a manufacturing shop.

I'm trying to get my cost down to around $10.00 :)

Bought the following parts at Home Depot:

Two 1 1/2" x 4" black steel pipe threaded on both ends

Four 1 1/2" black steel pipe caps

One piece of steel stock (to weld to the two pipe weights and to the flange of the muffler clamp

Bought the following from Tractor Supply Centers (TSC)

One 3 1/2" Heavy Duty Muffler Clamp

Total cost about $14.00

If I fill each pipe with 1/4" nuts and sand they will weigh 2 1/2 lbs each. Filling with pea gravel gets me down to about 2 lbs each for a total mass weight of about 4 1/2 lbs for the entire assembly. I think I'm going to go with the pea gravel as I don't want to add too much additional weight as this will be the second dampner hanging on the muffler. I'm going to try to install it vertically on the down pipe.

Will post pic's when completed :)

Bought the following parts at Home Depot:

Two 1 1/2" x 4" black steel pipe threaded on both ends

Four 1 1/2" black steel pipe caps

One piece of steel stock (to weld to the two pipe weights and to the flange of the muffler clamp

Bought the following from Tractor Supply Centers (TSC)

One 3 1/2" Heavy Duty Muffler Clamp

Total cost about $14.00

If I fill each pipe with 1/4" nuts and sand they will weigh 2 1/2 lbs each. Filling with pea gravel gets me down to about 2 lbs each for a total mass weight of about 4 1/2 lbs for the entire assembly. I think I'm going to go with the pea gravel as I don't want to add too much additional weight as this will be the second dampner hanging on the muffler. I'm going to try to install it vertically on the down pipe.

Will post pic's when completed :)

Here's the pics of my homemade dampner. Took me about 45 minutes to build and install. Might have been quicker if I knew how to weld :lol: I moved the dealer installed dampner forward and installed the second one directly behind it. The DIY dampner definitely weighs more than the OEM one by a pound or so. I chose to fill the pipes with pea gravel because it was available and I didn't want to add too much more mass as it was the second install. Lead shot would be a good choice if it were the only one you were going to install. Try to keep things tight together when you assemble / weld so that you will have enough clearance between the dampner and the floor boards etc when installed. Leave a little gap between pieces to avoid rattles.

BTW...I'm keeping a copy of these photos in my truck just incase I get questioned about the "device" going into Canada (border) as it does look like a secret hinding place.

skoryaro2
let us know if it helps to add more. If it does I will make a second one this weekend

NOT bad:ro) I may have to try this cheap fix before I try to fight with my dealer. My drone is getting worse ( I'm at 10,000). It comes in at 40mph up to 47. Reappears at 57mph up to 65mph. I can now hear and feel over the radio. GM needs to get there s@#t together if they are going to keep selling $50,000 trucks. Thanks for all the info and pics guys. This site is a true blessing for all of us truck nuts:D

skoryaro2
let us know if it helps to add more. If it does I will make a second one this weekend

I've run about 30 miles now with the second one on and I can't see where it has made much of a difference. They way I have them positioned now may even be causing a little more noise - not sure yet. FYI - On the last pic above that shows both installed, the white stripe on the exhaust pipe is were the OEM dampner was installed by the dealer. I may try moving the OEM one up on the vertical down pipe and my DIY one to the position where the OEM one was to see if that makes any difference. The only problem is, with the vertical install I will only have about 1/2" clearence between the dampner weight and the trans line and frame. Any opinions on whether that would be enough clearance when everything starts to flex?? Or do the trans lines and muffler all move together?

I've got an '04 LB7 that I replaced with a 4" MBRP including the down pipe; was having a ton of drone and noise at the 1700-1900 rpm level. On another thread, it was discussed about adding weight to the front down pipe. I got some 3/4" angle iron and cut it into 18" lengths and added four of them to the front pipe just behind the 90 degree bend with three stainless steel sewer style clamps. Made a huge improvement. Wife says it sounds tons better now in the cab. I might try and add another piece and see if it gets any better. The original idea came from another thread I believe in the LB7 section or the aftermarket because of drone in some of the 4" exhaust installs.

BTW...I'm keeping a copy of these photos in my truck just incase I get questioned about the "device" going into Canada (border) as it does look like a secret hinding place.They look like pipe bombs, too. :eek:

[QUOTE=skoryaro2] Lead shot would be a good choice if it were the only one you were going to install.

I don't think this would work too well. Lead melts at about 621°F. Exhaust gasses coming out are around 1000°F, don't know how much they cool off by the time they get to the dampener, but it would probably melt the lead and it would be sloshing around inside, maybe.:ro)

[QUOTE=skoryaro2] Lead shot would be a good choice if it were the only one you were going to install.

I don't think this would work too well. Lead melts at about 621°F. Exhaust gasses coming out are around 1000°F, don't know how much they cool off by the time they get to the dampener, but it would probably melt the lead and it would be sloshing around inside, maybe.:ro)

Good point - How 'bout steel shot and / or copper BB's?

skoryaro2,

I have a friend whose wife is a very high ranking official at the border patrol between the US and Canada. Forwarded a copy of the picture of the dampner you made to her to look at. Her initial response wasn't too bad. Her followup phone call was really bad. They have mirrors and camera's mounted in various places to get a good "view" into, under, around, etc. your vehicles when you pass back into the US. She said that the Canadian side has some really good high tech stuff too. But her response was that they look like pipe bombs or smugglers bags and if she saw them when passing the checkpoint, you would be having some serious problems. She said the Canadian side does not take any of this type of stuff as funny either and since you would already be on their side of the line, you are on your own. I did not give her any area details or anything, just a "if this was on the exhaust" type question with the picture. She did say that people have already taken the GM factory dampners and have modified them to carry stuff in them. They are aware that GM does use them but they don't like them. To easy to modify and carry contraband. She said you could sit at the customs area for "hours" until they can clear it. In the post 911 era, they take no chances! She is a really nice person, rides a mean snowmobile, but takes her job dead serious. If someone or something gets in the US that doesn't belong, she takes a lot of heat for it. Her suggestion would be to make it look as factory as possible; she has pictures of the factory ones in their "note" book. After talking to her, I say it's a great idea, just not for going across the borders. Sorry to burst the bubble for you, but I would hate for you to get in some trouble or draw attention to your self when crossing.

skoryaro2,

I have a friend whose wife is a very high ranking official at the border patrol between the US and Canada. Forwarded a copy of the picture of the dampner you made to her to look at. Her initial response wasn't too bad. Her followup phone call was really bad. They have mirrors and camera's mounted in various places to get a good "view" into, under, around, etc. your vehicles when you pass back into the US. She said that the Canadian side has some really good high tech stuff too. But her response was that they look like pipe bombs or smugglers bags and if she saw them when passing the checkpoint, you would be having some serious problems. She said the Canadian side does not take any of this type of stuff as funny either and since you would already be on their side of the line, you are on your own. I did not give her any area details or anything, just a "if this was on the exhaust" type question with the picture. She did say that people have already taken the GM factory dampners and have modified them to carry stuff in them. They are aware that GM does use them but they don't like them. To easy to modify and carry contraband. She said you could sit at the customs area for "hours" until they can clear it. In the post 911 era, they take no chances! She is a really nice person, rides a mean snowmobile, but takes her job dead serious. If someone or something gets in the US that doesn't belong, she takes a lot of heat for it. Her suggestion would be to make it look as factory as possible; she has pictures of the factory ones in their "note" book. After talking to her, I say it's a great idea, just not for going across the borders. Sorry to burst the bubble for you, but I would hate for you to get in some trouble or draw attention to your self when crossing.


Thanks for the effort - I was already aware of that, so that's why it was a concern. Good post though to get the word out to all!

I already have mine back on the bench for modification. I'm going to take the caps off, fill with concrete (with a small diameter tube down the center to leave an exposed hole) and then paint them black with heat paint.

The above post about attaching angle iron with hose clamps might be a good other option.

I cross into Canada a few times a year to snowmobile and I have been stopped and searched twice; it's basically like being stripped searched; they go through everything and you better have your paperwork for the sleds with you too. Since I know her, I thought I would ask. Don't want to get a member in trouble with the law if we can help it!

The angle iron with the clamps has worked pretty well for me. I picked that up on another thread around here somewhere--one of the Navy guys and how they keep the subs quiet. I might add another bar or two and see if I can get it even better. Maybe even add some bars back in front of the muffler itself.

Thanks for the effort - I was already aware of that, so that's why it was a concern. Good post though to get the word out to all!

I already have mine back on the bench for modification. I'm going to take the caps off, fill with concrete (with a small diameter tube down the center to leave an exposed hole) and then paint them black with heat paint.

The above post about attaching angle iron with hose clamps might be a good other option.

FYI - Leaving the end-caps off, filling with Quik-Crete (sp) cement and painting it black with heat paint gets it looking pretty much close to a OEM dampner for well under $10.

As for adding a second one, I can't see where it made much of a diff for me, but adding the first one was an improvement. I'd like to hear if anyone tries the strap-on angle iron method and what the results where.

Hello, I noticed a vibration just off idle and at part throttle at any speed after I installed my Banks monster exaust. I can feel it in the floor and foot feed.
After the cat is gone I will take care of it with some of your weight ideas. My vib. feels like some sort of harmonics that can be delt with by your weight idea. I have seen weights hanging all over the place on cars. The weights I have seen have never been of the loose shot type, always solid and some are rubber mounted.

I work for Mercedes as a tech. All of the diesels, and I mean all, have a piece of flex on the down pipe. Looks like the pipe you could buy at a muffler shop and bend yourself but only 8 inches long on the MB. Also on most of our MB's there is a piece of short wire mesh pipe in the front part of the exaust. I am sure these are used to deal with vibration issues.
Now I just have to find this flex pipe in our size...I will let you all know. Den.

I had the dealer install the weight to try and correct the drone but found it did not help very much. Epiflex.com sells the braided flex connectors mentioned for the exhaust and I have been thinking of ordering one. Since I have not called yet I do not know what their pricing would be.

How about taking the 1 1/2" pipe, filling it with silicone, with a solid rod in the middle for the weight. I think you would do this after the welding is done as not to disturb the silicone. This should work as the same princeable as the dampers that Mathews puts on their bows. You would probably have to use high temp silicone. And for giggles to help anchor the silicone in the pipe I think I will take my wire feed and zap a few dots inside the pipe and on the center rod for the silicone to hold onto. HMMMM, there I go thinking out loud again.


I do think that would :grd:

I work at a Mercedes dealer but eat lunch at the infinity dealer next door. Today I walked under one of the cars and it had a 2x2 inch block of steel rubber mounted to the back side of the muffler about even with the rear tire. the car was running and the weight was just shakin away. The most important thing I noticed was that the weight had a safety device to keep it atached should the rubber/weld should fail. Thanks for the web sight for the flex. I have not looked yet but I was thinking a 3 inch piece at the flange area might work.

If anyone uses the flex pipe, please report your results. It seems that the weights do help most, but not all. Even with them though there is not a 100% cure.

On a second thought. There seems to be a direct relationship to my noise and the outside air temperature. Seems like the colder it is outside, the louder the noise. Is it possible that the whole thing is turbo related?

My line of thinking is: Cold air is more dense than warm air (isn't that why we have intercoolers - to cool the air going into the turbo?) so, if it is colder outside, denser air is being pushed. Also the turbo is the big component change over the LB7, except for the EGR which doesn't seem to make a difference in the droan noise when it is blocked.

Off base????

Hi to all,

See my post on engine vibration being transmitted into the steering wheel cab, brake peadl ect, It is worse when temps outside drop and vice versa. I feel it is an engine mount problem Gm currently working on truck,( changing mounts adding exhaust weights ect). My truck also has the 1700 rpm droan like the rest.
Thanks Laker

My LLY did it yesterday and i told myself "its a diesel...deal with it". WELL!! Im glad I read this thread!! Thanks everyone for the tips/help. One question for skoryaro2...you said you had them replace the steering shaft because of the infamous CLUNK. My dad's 03 Tahoe did this until they replaced the shaft...i assumed GM had this fixed by 2005!!! Can I take my truck to the dealer and say "does mine have the newest steering shaft???" Even tho mine may not really clunk, its something that will annoy me until i KNOW I have the updated part!! haha..thanks!

---Ben

I installed the 4inch downpipe removing the CAT. My drone issue went away completely.

2005 silverado 2500hd 4*4 allison/dmax - just to reiterate, I to am having the same annoying humming noise at 1700-1800 rpm, Is there a way we can all send gm something so they can officially post a fix or admit there is a problem?


Thanks for the post I thought I was going to go crazy trying to keep the engine out of that rpm range because it is that loud.

Vibration 1700-1800 rpm
Gm fix replace converter and muffler assembly
2500/3500 short box extended and crew cab models with lly.

Does anybody know if those weights are a GM part? I'd like to make my own and install it.

i just got a call from my deler gm is putting on a new complete exhaust system it is on order. dealer got a notice on july 27 to replace these bad systems. my belief is they put the lb7 exhaust on the 041/2s and some 05s and its not compatible . juke6.6

My drone went away when I lifted it. Any logic to that?

:rippedhan My drone went away when I lifted it. Any logic to that?
I'm not sure, but when I took my stock exhaust off to put Banks on, the pipe was about 1/4 to 1/3 smashed where the pipe ran near the frame. I think it was hitting the frame, which would make it incompatible....correct??
But I did not replace the downpipe or cat, Banks said that they don't make those for the 05 model. My buddy with the 04 1/2 got the downpipe with his kit. The only thing I notice noise wise, is when I shut it off sometimes it clunks when It shakes.

gm service bulletin 05-06-05-002 - Vibration 1700-1800 rpm
Gm fix replace converter and muffler assembly
2500/3500 short box extended and crew cab models with lly.

Anybody have any info on this???

Thanks!

Rob

Recieved my downpipe today from http://www.dieselperformanceparts.com/ recieved it next day w/o asking. $135 came with hardware and all. Going to put it on and see if "droan" goes away, if not a 12 inch piece of flex from http://epiflex.com/epi_flex.html should handle it!!!

Wow, went for a drive last night with my wife and it's almost 20 degrees colder than the last time I drove the truck. It only has 800 miles on it. I had been messing around with the airbox looking at all the threads here and thought I put something back on wrong before we left. The "drone" was unbearable. After reading all the posts on the LLY since I bought the truck, I'm wondering if I should have bought the Dodge! I guess I'll have to get ahold of my dealer to see about this service bulliten.

Quote:
Originally Posted by jlaures http://dieselplace.com/forum/images/misc/backlink.gif (http://dieselplace.com/forum/showthread.php?p=665452#665452)
gm service bulletin 05-06-05-002 - Vibration 1700-1800 rpm
Gm fix replace converter and muffler assembly
2500/3500 short box extended and crew cab models with lly.

Anybody have any info on this???

Thanks!

Rob

I'm having the 1700-1800 rpm whine on my 2005 Chev. I took it in a couple days ago to my dealer and had the dampeners installed, but the whine is still there. It's better, but still not good! I told them the other day that there is a service bulletin out on it and gave them the number as posted by jlaures
I called the dealer this morning to tell him I still need this fixed.....they said "not sure what we can do about it". I asked about the service bulletin and they said they couldn't find one for it. I told them to look again as my info (from here) is that there is a bulletin out on this.

Now, what to do???? :confused:

Any help/advice would be appreciated!

Thanks guys!

Does your dealer have a computer? Mine does and yesterday I was with him and saw this listed on GM's site. Search, 2005 gmc hd crew cab short box, lly, Subject: exhaust moan/vibration ( replace converter assembly and exhaust muffler asmbly). It took three weeks to get parts but exhaust vibration/moan gone at 1700-1800.

Thanks for the info jlaures. Mine is a 2005 Chev 2500HD Ext cab, short box, LLY, but the service bulletin should be the same. I suspect my dealer wasn't being entirely truthful when he said he couldn't find anything on this. I've sent your info to him and I'll see if he can suddenly find this now.
Thanks again.

When my dampners were installed it helped a litle - but not a complete cure either. I'm going to approach my dealer next week on this new fix and request that he order the parts before I leave it for service. I'll report my progress.

Does your dealer have a computer? Mine does and yesterday I was with him and saw this listed on GM's site. Search, 2005 gmc hd crew cab short box, lly, Subject: exhaust moan/vibration ( replace converter assembly and exhaust muffler asmbly). It took three weeks to get parts but exhaust vibration/moan gone at 1700-1800.


JLAURES, Could you post your dealers name and phone number and who your service tech was? That way people who are having trouble with their dealer finding the info can have their dealer contact your dealer to confirm that the info actually is ligit.

FYI - I called my dealer today, gave them the service # and they found the info without any trouble. Will be takning it in later in the week.

I sure would like to know what is different about the CAT and exhaust system that they are putting on.

FYI - I called my dealer today, gave them the service # and they found the info without any trouble. Will be takning it in later in the week.




BTW - the first dealer I went to couldn't find any info on it. This dealership found it quickly. If at first you don't succeed....find another dealer :)

I now have 2005 4x4 3500 CC duramax. I am posting here because what you talk about sounds just like the ford 6.0 03 with the vari turbo. ford did new turbo mounts. problem was found to be the v clamps used to secure exhaust to turbo and exhaust manifolds. answer was to loosen all clamps and then tighten each clamp a little until proper torque so as to prevent binding. worked great then no drone.

Has anybody had the new system installed per the bulletin? If so, did it work? Can you please post the new part numbers for the system? I would like to have this done, but I don't want to wait a week for the parts to come in if I don't have to . I would like to call the local dealers and see if they have the parts in stock.

thanks

I had my wife take my truck in last week because she works right in town and gave the dealer a copy of the bulletin #'s. They drove it and heard the problem and told her they were ordering the parts to fix it and they will call me when they are in. The bulletin said to replace the exhaust so I assume they are ordering a new exhaust. She didn't ask. Women....... Oh and by the way they did the computer updates and installed my fuel life monitor too. They are pretty good IMO.

what is this noise? anyway some can record it. i am used to my 95 PS Ford and that thing was the loudest thing.

Has anybody had the new system installed per the bulletin? If so, did it work? Can you please post the new part numbers for the system? I would like to have this done, but I don't want to wait a week for the parts to come in if I don't have to . I would like to call the local dealers and see if they have the parts in stock.

thanks

Mines at the dealer right now. Dropped it off this AM with a copy of the Service Bulletin. He has a list of about 6 things to look at. I'll report what happens RE: the exhaust.

Dealer finally found the Service Bulletin, after I gave him the number 3 times!. Mine is going in next Tuesday for replacement of exhaust etc.

Mines at the dealer right now. Dropped it off this AM with a copy of the Service Bulletin. He has a list of about 6 things to look at. I'll report what happens RE: the exhaust.

Truck was at the dealer for 2 days. Got nowhere with my repairs or the exhaust (droan) repair per the TSB. First day he said that he could get the parts as listed on the bulletin. Next day he said he may not be able to. Suppose to call me tomorrow with a timeline for parts. They were pretty much useless. First time at this "new" dealer....won't be going back.

Usually when I have an issue (TSB) with my truck, the dealer orders the parts first, then I bring the truck in to do the fix.
What's with your "new" dealer?? :eek:

Usually when I have an issue (TSB) with my truck, the dealer orders the parts first, then I bring the truck in to do the fix.
What's with your "new" dealer?? :eek:

Tried that ........they wouldn't do it until they "re-documented" the problem. Tried this dealer because it was much closer to home.:badidea: Lesson learned.

Dealer called and said the parts are in to fix the horrible 1700 RPM drone problem. It goes in Tuesday to get the work done. I asked him to do the flash for the Fuel Filter monitor while it's in there, he said ' no problem'.

Am I correct in assuming that ALL the latest updates get done at the same time when they do the reflash for the DIC?????

Yes, that is correct. They should check to see for all available updates, BUT to be sure I would be asking them to check!

Sometimes you really have to wonder if the dealer really knows anything, or if he's just playing dumb! Wife took my truck in this morning for my appointment to have the 1700rpm drone fixed. I told her to check to be sure they were doing the flash for the Fuel Filter Monitor and all the other latest flashes (I had phoned last Friday to ask to have this added to the WO).
Just rec'd a call from dealer, saying "Gee, we don't know if it is even possible to do this! We'll have to check to see if GM has any program or something that would do this, as we've never had to do anything like this before". I said all you do is put on the TechII and flash the PCM.....he said "Where are you getting all this info?" I told him it's all readily available on the internet, and he suddenly seemed to know what I was talking about......you'd think it was supposed to be some sort of state secret or something. Then he said there would be a cost of $50 to $100 to do the flash (strange how he could come up with a price for something he claimed he knew nothing about just 2 minutes earlier), I said I would go $50 max as it is only a 10 minute job.
Now we'll see if he actually does the fixes I've asked for. From what I've read about the GM Calibration page, I think it should show if they've actually done the updates for my vehicle.....can anyone confirm this is correct?
Thanks guys.

BEWARE......Go to another dealer ASAP!!!! Something is NOT right with this picture to say the least. You have a 2005 Dmax correct?
You don't have over 36k miles do you? Then the reflash will NOT cost you a penny! It's covered under warranty, period!!

Can someone please give me the actual service bulletin number so I can contact me dealer. I don't wan the "weights" added, I want the complete fix. BTW, I have a 2005 and mine has the fuel filter monitor already active. Were the later builds done at the factory, or did my dealer do it beofre I got it?

Edit - is this all I need? - gm service bulletin 05-06-05-002

Can someone please give me the actual service bulletin number so I can contact me dealer. I don't wan the "weights" added, I want the complete fix. BTW, I have a 2005 and mine has the fuel filter monitor already active. Were the later builds done at the factory, or did my dealer do it beofre I got it?

Edit - is this all I need? - gm service bulletin 05-06-05-002

Look at this thread http://dieselplace.com/forum/showthread.php?t=44458


And your DIC probably came from the factory that way - mine was built early '05 and does not have it.

BEWARE......Go to another dealer ASAP!!!! Something is NOT right with this picture to say the least. You have a 2005 Dmax correct?
You don't have over 36k miles do you? Then the reflash will NOT cost you a penny! It's covered under warranty, period!!

I just got off the phone with GMCanada. They say that unless there has been a recall letter issued, the cost to do the PCM flash upgrades is not covered by warranty.

I just got off the phone with GMCanada. They say that unless there has been a recall letter issued, the cost to do the PCM flash upgrades is not covered by warranty.
Well then, I guess you're in Canada and it's a different set of rules up there vs. USA. :mad:

I just got the TSB done, 99% fix, much better. See my post under the TSB section.

Also, the new set-up does NOT have a 4 bolt flange between the converter and the muffler. It uses a straight pipe with an exhaust clamp. Is this how the LB7 motors are? I know the TSB only pertains to the LLY?:confused:

Also, the new set-up does NOT have a 4 bold flange between the converter and the muffler. It uses a straight pipe with an exhaust clamp. Is this how the LB7 motors are? I know the TSB only pertains to the LLY?:confused:

I think it was mentioned here that the 2006 LLY's have the "no flange" ehaust system. Looks to me like they are using that exhaust system as the fix.

Vibration 1700-1800 rpm
Gm fix replace converter and muffler assembly
2500/3500 short box extended and crew cab models with lly.
Had mine into my dealer today. Bad news is that the gm service bulletin 05-06-05-002 is for crew cabs only, not for extended cab like I have. He said GM is aware of the problem and is looking for a fix for extended cab models as detailed on PIT3457A. Bummer!!!!

I also had asked to have the PCM flashed for the fuel filter monitor upgrade. When I went to pick it up, they had a bill for $105 for that. I talked to the Service Manager and said that didn't seem right, so he called GMCanada and they confirmed that the upgrade is NOT covered by warranty. Good news is the Service Manager said "Gm says it isn't covered but I think it should be, so we'll absorb the cost". So they cancelled the $105 anad gave it to me free. Nice guy!!!!

So I guess I'll have to crank the CD or wear earplugs for the drone 'cause I doubt GM will have a fix for me anytime soon.

Is anyone getting the noise with a longbed and if they are will it be covered? Or will only shortbeds be covered?

Is anyone getting the noise with a longbed and if they are will it be covered? Or will only shortbeds be covered?

GM service bulletin #05-06-05-002 (Jul 27, 2005) Exhaust Moan/Vibration specifically states it is for 2004/2005 Chev or GM 2500HD/3500HD Series Crew Cab Short Box pickups.

My 2500HD ext cab short box was not covered and they wouldn't do the fix for the moan/drone on it.

My truck went in today to the dealer for the exhaust droan/vibration. I drove the 45 miles one way, for them to tell me they will fix it, but I have to bring the truck back when the parts are in. So another 90 mile round trip this week.
At least I was smart enough to take the entire tech bulletin with me to show them. They are replacing exactly whats in the bulletin, hopefully that will fix the problem. Sunday I pulled an empty car trailer and the droan was louder under that light of a load.

For those who need the tech bulletin here is the link

http://www.alldata.com/tsb/General-Motors/1122447600000_1128582000000_05-06-05-002/index.html

Here's the pics of my homemade dampner. Took me about 45 minutes to build and install. Might have been quicker if I knew how to weld :lol: I moved the dealer installed dampner forward and installed the second one directly behind it. The DIY dampner definitely weighs more than the OEM one by a pound or so. I chose to fill the pipes with pea gravel because it was available and I didn't want to add too much more mass as it was the second install. Lead shot would be a good choice if it were the only one you were going to install. Try to keep things tight together when you assemble / weld so that you will have enough clearance between the dampner and the floor boards etc when installed. Leave a little gap between pieces to avoid rattles.

BTW...I'm keeping a copy of these photos in my truck just incase I get questioned about the "device" going into Canada (border) as it does look like a secret hinding place.

Looks like a couple of Pipe Bombs. Just hope you don't get an undercar mirror inspection at a roadblock. The police will have thier bomb-squad haul your truck off and blow it up.

Had mine fixed Wednesday. Basically they put the 2006 LLY exhaust under the truck. Downpipe all the way back. Noise gone.

I ordered a flex coupler from epiflex and just received it today. When I put it on I will let you know if it seems any better. I had the weights on but took them off because they did not help that much.