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Old 12-12-2012, 09:54 AM   #1 (permalink)
NateTheGreatLB7
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New shocks now loud bang in front end??

Just installed my new shocks(bilstein 5100's) front and rear. Pretty easy install minus the fact that i dont have air tools at the moment. Hand cranked everything. All was well on her maiden voyage until I went over some speed bumps in my gyms parking lot. Theres a very loud bang from the front end when going over them. Its louder on the passenger side than the drivers side. I checked the bump stops and the drivers side is deteriorated to almost nothing. Plenty of room between A-arm The passenger side(in bad shape) is badly crushed into the A-arm. What could it be? Shocks came from NorCal so im pretty confident they are the correct ones. Could I not have tightened the top bolt enough? Truck has a 6" lift so I cant adjust torsion bars. Ill try to get some video uploaded when i get off work. Any ideas appreciated. Trying to trouble shoot the problem.
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Old 12-12-2012, 08:32 PM   #2 (permalink)
D_R_C
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I would think everything you explained on the condition of the front end on the bump stops and one side banging metal to metal, that's more than likely the reason for the bang. And needs to be corrected. The specs from Coginito says you need at least 5/8"-3/4" gap on the upper control stop when setting level. Did you crank the torsion bars up to get more height? If so that minimizes the gap you need so it does not slam-bang when you go over speed bumps.
I went with the leveling kit and had the same problem and eventually went with the Gognitio upper control arms which lined up the ball joint better which helped with the ride and increase the gap on the upper control stop.
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Old 12-13-2012, 08:52 AM   #3 (permalink)
NateTheGreatLB7
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Quote:
Originally Posted by D_R_C View Post
I would think everything you explained on the condition of the front end on the bump stops and one side banging metal to metal, that's more than likely the reason for the bang. And needs to be corrected. The specs from Coginito says you need at least 5/8"-3/4" gap on the upper control stop when setting level. Did you crank the torsion bars up to get more height? If so that minimizes the gap you need so it does not slam-bang when you go over speed bumps.
I went with the leveling kit and had the same problem and eventually went with the Gognitio upper control arms which lined up the ball joint better which helped with the ride and increase the gap on the upper control stop.
Havent been able to get pictures or video yet, not enough hours in the day! I bought the truck with a lift on it so the torsion bars aren't adjustable anymore. The shocks that were on it were original to the lift and should have been replaced probably 30k ago. Might as well been 4 pieces of angle iron welded in place. Maybe now that the shocks actually move im hitting metal to metal. Fix one issue, another comes up! The pads on my bump stops appear to be large rectangles but ive only been able to find the ones that look like snow men. Say i replace the bump stop pads and they still touch A-arm. Could i shave them to make proper distance you mentioned above? Thanks for the input btw!
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Old 12-13-2012, 10:40 AM   #4 (permalink)
D_R_C
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The 5/8-3/4 measurement I'm talking about is the upper control arm stop.
I thought I had a picture but its only on my home computer and I'm out of town.
You might get on Cogninto's website and search on the install instructions for the UCA.
When you crank the torsion bars up to lift the front you close the gap on the bump stop which affects the ride.
Here's a thread I did on the results I got before and after the Cogninto's UCA.

COGNITO UCA"S worked for me
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Old 12-13-2012, 11:02 AM   #5 (permalink)
NateTheGreatLB7
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https://www.youtube.com/watch?v=Qpuo...yer_detailpage

Wish i would have showed the old shocks. They're so far gone its funny.
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04 Chevrolet Silverado 4x4, LB7 Duramax
- 8in Fabtech Suspension lift
- Airdog 150 lift pump
- PPE Boost Valve
- K&N Cold Air Intake
- EFI Live DSP5 Tuning from Danville Performance
- Industrial Injection R3 40% over injectors
- Edge Insight CTS
- 5" Turbo Back Straight Piped, 3.5" Homemade turbo horn
- BMW Turbo Wheel Upgrade, - MBRP downpipe
- Bilstein 5100 All Around
- Built Tranny from Jim at Maximum Overdrive Transmission
- 35x12.5x17 Toyo Open Country MT

- 521hp@1006trq at Danville Performance 5/2/2012
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Old 12-13-2012, 11:33 AM   #6 (permalink)
D_R_C
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That's the lower stop when you cut the rubber/nylon to get more travel you really should cut much more than 1/4-3/8 off.
If you cut more than that then you will have to much travel.
What affects the bang and harsh ride when going over something like speed bumps is the upper control stop being closer than 5/8" gap.
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Old 12-13-2012, 02:15 PM   #7 (permalink)
NateTheGreatLB7
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Quote:
Originally Posted by D_R_C View Post
That's the lower stop when you cut the rubber/nylon to get more travel you really should cut much more than 1/4-3/8 off.
If you cut more than that then you will have to much travel.
What affects the bang and harsh ride when going over something like speed bumps is the upper control stop being closer than 5/8" gap.
DRIVER, 1" or more clearance
[img=http://s10.postimage.org/6u8ncqpp1/2012_12_13_13_25_00_982.jpg]

PASS, 1.5" or more clearance
[img=http://s14.postimage.org/h7u1hfbot/2012_12_13_13_25_17_826.jpg]

Do these need replaced or just the lowers?
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04 Chevrolet Silverado 4x4, LB7 Duramax
- 8in Fabtech Suspension lift
- Airdog 150 lift pump
- PPE Boost Valve
- K&N Cold Air Intake
- EFI Live DSP5 Tuning from Danville Performance
- Industrial Injection R3 40% over injectors
- Edge Insight CTS
- 5" Turbo Back Straight Piped, 3.5" Homemade turbo horn
- BMW Turbo Wheel Upgrade, - MBRP downpipe
- Bilstein 5100 All Around
- Built Tranny from Jim at Maximum Overdrive Transmission
- 35x12.5x17 Toyo Open Country MT

- 521hp@1006trq at Danville Performance 5/2/2012
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Old 12-13-2012, 04:33 PM   #8 (permalink)
D_R_C
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I suggest you stop by a shop that deals with lifted suspension and get their suggestions on what to do. You don't have to have them do the repair but a few ideas from some places/shops that can actually see the problem would be your best bet. IMO
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2007.5 GMC Sierra SLT 3500 SRW C.C. 4X4 LMM Z71 - AirDog, Cognito NON Torsion Bar 4" lift, Cognito UCA's, Pitman/Idler arm support, Bilsteins 5100's front/rear
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Old 12-13-2012, 05:29 PM   #9 (permalink)
Buckeye 06DMax
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You say that you didn't have to compress the shocks to put them in? Then that tells me they are fully extended I would think...I just installed the same shock and had to compress mine to get them in.
The lower bump stops should be so the frame is just touching the top of bump stop. I just installed the yellow ones on mine...
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Old 12-14-2012, 11:05 AM   #10 (permalink)
NateTheGreatLB7
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Quote:
Originally Posted by Buckeye 06DMax View Post
You say that you didn't have to compress the shocks to put them in? Then that tells me they are fully extended I would think...I just installed the same shock and had to compress mine to get them in.
The lower bump stops should be so the frame is just touching the top of bump stop. I just installed the yellow ones on mine...
Bilstein (Zinc) BE5-E710-H1 Chevy/GM HD 01-10 2wd/4wd Front 4'-6'
Lift (Factory Position)

Thats is what my invoice for the front shocks said, I even sent a picture of the truck to make sure to get the correct shocks. It says 6" lift on it? So you think it could be the wrong shock? No I didnt have to compress the front shocks when I put them in. The holes lined up perfectly. My old shocks are too far gone to compare length. I tried that before I put the new ones on.

Im going to get new bump stops tonight. Then maybe take the truck out again. Its just been sitting since the install. If that doesnt fix it then I've pretty much narrowed it down to the incorrect shocks. How much did you have to compress yours?
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04 Chevrolet Silverado 4x4, LB7 Duramax
- 8in Fabtech Suspension lift
- Airdog 150 lift pump
- PPE Boost Valve
- K&N Cold Air Intake
- EFI Live DSP5 Tuning from Danville Performance
- Industrial Injection R3 40% over injectors
- Edge Insight CTS
- 5" Turbo Back Straight Piped, 3.5" Homemade turbo horn
- BMW Turbo Wheel Upgrade, - MBRP downpipe
- Bilstein 5100 All Around
- Built Tranny from Jim at Maximum Overdrive Transmission
- 35x12.5x17 Toyo Open Country MT

- 521hp@1006trq at Danville Performance 5/2/2012
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