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Drivetrain - 2001 - 2010 Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. First through fourth generation...

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Old 12-01-2018, 11:42 PM   #1 (permalink)
Octane
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Driveshaft vibration, 2 piece, sacked center bearing or??

Hey guys, So I'm really having issues with my truck at the moment, bought it with a 6" lift, had bad vibration then, I pulled the lift, everything should be "stock" and when I load it with ~1300# of weight in the back, right around 55-65 mph I get a bad vibration, I don't recall it this bad last winter (sledding season) and just picked up my sleds to find its gotten worse. At the speed on throttle or off it's still there, may get worse when increasing the throttle a bit.

I have inspected my center bearing and googled the matter, It's not torn rubber, The bearing is fine. However perhaps the rubber has gone soft? allowing it to move more in the mount? I did have my drive shaft dropped and felt U joints last spring, felt fine.

I replaced my trans mount with the anchor one however I had noted it was approx.. 1/4-1/2 and inch lower? perhaps thats an issue?


Then you google and find people saying/complaining of the issue with vibration on the 2 piece and go to the aluminum 1 piece? was the 2 piece that bad from gm? Or do I have something else going on? Thanks!

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Last edited by Octane; 12-01-2018 at 11:44 PM.
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Old 12-02-2018, 02:26 PM   #2 (permalink)
Ron Nielson
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I think you need to pull your driveshaft, carefully check all of the u-joints, splines, tail-shaft clearances, etc, and replace if needed. If driveshaft is A-ok, then check your driveline angles to make sure they are within specs. Once that is assured, then have driveshaft balanced.

One thing that you may find is that you have out of balance tires that masquerade as a driveshaft out of balance. Jack up rear wheels off the ground 3-4 inches on jack stands, block front wheels, put trans in drive and see if tires are truly in balance and are round. I went up to 70 MPH and used a stick steadied by a jack stand to just touch the tire tread to see if there was any movement of the tread.

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Old 12-02-2018, 07:12 PM   #3 (permalink)
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What’s the story on wheels and tires?

Old, new, ones that were on it before?
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Old 12-02-2018, 08:37 PM   #4 (permalink)
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Quote:
Originally Posted by Octane View Post
I replaced my trans mount with the anchor one however I had noted it was approx.. 1/4-1/2 and inch lower? perhaps thats an issue?
There's lots to look at and there all not the same.

Yes, The driveline angles are a little off will cause this.

When the vibration occurs, see if it happens when accelerating throught the speed, decelerating throught the speed and put it in neutral while at the speed of vibration. If it goes away in neutral it is most likely a drivetrain issue (ujoints,driveshafts, axles). If it is still there in neutral it's a tire, wheel issue. If it only happens on accel or decel it could indicate a differential problem also. First thing to check is the drive shaft and ujoints.

Your rubber isolator around the support bearing might have dry rotted.

There are TSB's for drive line vibration. Shimming transmission support.

Last edited by G2GBY; 12-02-2018 at 09:00 PM.
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Old 12-03-2018, 12:55 AM   #5 (permalink)
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Quote:
Originally Posted by Ron Nielson View Post
I think you need to pull your driveshaft, carefully check all of the u-joints, splines, tail-shaft clearances, etc, and replace if needed. If driveshaft is A-ok, then check your driveline angles to make sure they are within specs. Once that is assured, then have driveshaft balanced.

One thing that you may find is that you have out of balance tires that masquerade as a driveshaft out of balance. Jack up rear wheels off the ground 3-4 inches on jack stands, block front wheels, put trans in drive and see if tires are truly in balance and are round. I went up to 70 MPH and used a stick steadied by a jack stand to just touch the tire tread to see if there was any movement of the tread.
Thanks for the suggestions, I'm sure its not tires as this issue has been there between my summer and winter set of wheels, I worked automotive and I feel fairly confident in knowing tire issues as I had to deal with it very often and customers. however after a summer I put the sleds in and wow... I drove to where I store my sleds and its over 60 mile drive, no real vibration on the way there, loaded up on the way back as mentioned its there and worse than last year it seemed, My truck in my ownership really hasn't been much for a work horse, I'd love to get a trailer soon but worry about towing it!.

Quote:
Originally Posted by Rambos_Ride View Post
What’s the story on wheels and tires?

Wheels/tires

Old, new, ones that were on it before?
Have the same issue between my summer wheels/tires and my winter set. Summers were brand new on new rims and balanced, and my winters are half worn on some mag wheels. I'm very certain its not them as it doesnt matter per wheel set.

Quote:
Originally Posted by G2GBY View Post
There's lots to look at and there all not the same.

Yes, The driveline angles are a little off will cause this.

When the vibration occurs, see if it happens when accelerating throught the speed, decelerating throught the speed and put it in neutral while at the speed of vibration. If it goes away in neutral it is most likely a drivetrain issue (ujoints,driveshafts, axles). If it is still there in neutral it's a tire, wheel issue. If it only happens on accel or decel it could indicate a differential problem also. First thing to check is the drive shaft and ujoints.

Your rubber isolator around the support bearing might have dry rotted.

There are TSB's for drive line vibration. Shimming transmission support.
Vibration occurs on accel, as soon as I let off it disappears. I may need to drop the whole assembly to truly check the u joints better but I do remember when I had it half off I did wiggle it around and never felt any rough u joints but Things can change as It was not THIS bad last winter, (ive had ongoing issues with this driveline battle) I know it's not a tire.

TONIGHT I jacked up the rear end and had my dad run it up. No load It's not really felt... Apply the brakes and it started to be jerky/shuddery, probably what I feel down the road however with the vehicle in motion it softens it?. I know my brakes are good and not warped..... I noticed however the rear drive shaft is slightly warped, so is the front half..... figure that's odd that both are.... It was a new drive shaft from gm when I had bought the truck... previous owner had his let go?. I watched my steady bearing and I couldn't see it moving at all, it ran smooth as could be. My father had issues trying to load it down with the breaks and maintain the speed of which it had the shudder so I was unable to see the steady bearing at that time.

On the thought of my steady bearing, I can move the shaft fairly easy and the rubber on the top that touches the frame mount moves too as if its not "squished" I almost wonder/feel as though maybe the rubber has fatigue'd/sagged down from gravity? hmm.

Thinking on my driveshaft being warped a bit.... It wasn't this bad last year and only happens on accel within that ~60-70mph range.... maybe angles again somehow? or?? I will have to try and check angles again when I get a chance to. I appreciate all the info and feed back!
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Old 12-03-2018, 11:00 AM   #6 (permalink)
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It took the one piece aluminum shaft to cure this problem on my truck. Worried for almost a year before finding a tech bulletin that outlined the problem. It was handled under warrant, so did not cost me anything at the time. Vibration only when loaded rather heavy with fifth wheel camper.
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Old 12-03-2018, 11:15 AM   #7 (permalink)
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Quote:
Originally Posted by TX airtech View Post
It took the one piece aluminum shaft to cure this problem on my truck. Worried for almost a year before finding a tech bulletin that outlined the problem. It was handled under warrant, so did not cost me anything at the time. Vibration only when loaded rather heavy with fifth wheel camper.
Interesting, I'll look up tsb's, is your truck a crew cab long box? I know the crew shortbox had aluminum shafts but not sure about the long box. Read something about driveshaft critical speed being an issue.
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Old 12-04-2018, 01:41 AM   #8 (permalink)
Rambos_Ride
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Sometimes with lifted vehicles the tailshaft bearing on the trans and/or the pinion bearing can get worn in a pattern...then when loaded with cargo you change the angles of the driveshafts and can get vibrations.

I'd pull your's out and have them checked and balanced, and make sure the ujoints are good.

Those center carrier bearings on the driveshaft are a consumable item...might be worth replacing if you haven't yet.
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Old 12-04-2018, 03:36 PM   #9 (permalink)
donny01tj
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Sounds like u-joints to me. I would replace them all and the center carrier.
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Old 12-05-2018, 06:05 PM   #10 (permalink)
Octane
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Thanks for the replies guys, I was thinking I probably can't go wrong if I do all 3 U-Joints and my steady. It's got to improve as somethings worn/changed to make it worse.

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2007.5 Chevy 3500 HD LMM CCLB.
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