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#06-08-61-003D: Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven


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Old 07-20-2012, 10:21 PM   #1
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Service Information



2007 Chevrolet Silverado - 4WD | Sierra, Silverado (VIN C/K) Service Manual | Bulletins By Category | Technical | Document ID: 2187623
#06-08-61-003D: Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator) - (Sep 10, 2008)

Subject: Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator)


Models: 2004-2008 Cadillac Escalade, Escalade ESV, Escalade EXT

2004-2008 Chevrolet Avalanche, Suburban, Tahoe

2004-2008 Chevrolet Silverado (Classic), Silverado

2004-2008 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

2004-2008 GMC Sierra (Classic), Sierra Denali (Classic), Sierra, Sierra Denali


This bulletin is being revised to update the model years and include diagnosis information. Warranty information has also been updated. Please discard Corporate Bulletin Number 06-08-61-003C (Section 08 - Body and Accessories).
Condition

Some customers may comment on a pop or clunk type noise while turning or driving on uneven road surfaces. This noise can be heard and/or felt at either the driver's or front passenger floor pan area.
Cause

Under certain conditions, normal movement between the frame and the #1, #2 or #3 body mounts may cause this noise to occur.
Diagnosis

If the vehicle is equipped with aftermarket (non-GM Accessory) running boards or the running board is mounted using the body mount bolt, remove the running boards prior to test driving the vehicle. This will eliminate the running boards as the possible cause of the noise.
Install the J-39570 Chassis Ears to the frame rail at or near the body mounts.
Test drive the vehicle to identify which mount is suspect.

Correction

Install an insulator at the suspect mount(s). The insulator should be installed between the upper portion of the body mount and the frame bracket. The #1 mount is the mount located just under the A-pillar. The #2 mount is the mount located just under the B-pillar. The #3 mount is the mount located just under the C-pillar. Use the procedure listed below.

Raise the vehicle on the hoist. It is recommended to use a four-post lift or strap the vehicle frame to the hoist arms.
For the left side mounts only, remove the intermediate park brake cable. Perform the following steps:
2.1. Remove the nut from the park brake equalizer.

2.2. Remove the intermediate cable from the equalizer.

2.3. Depress the retaining tabs that secure the park brake cable to the frame.

2.4. Pull slightly on the cable from the mounting area in order to provide slack for body movement without binding the cable.
Remove all of the body mount bolts on the side being repaired.
Properly support the body at the body mount area.


Caution: When you remove the body mount, do NOT separate the frame from the body more than is necessary. Possible personal injury and damage to multiple parts may result.
Lower the chassis accordingly in order to remove the upper portion of the body mount.


Install the new insulator to the bottom of the top portion of the body mount. The picture shows the insulator (1) location after the body mount is reassembled.
Install the body mount to the frame bracket.
Perform the following procedure before installing the bolts.
8.1. Clean the bolt threads of all the original thread locking compound.

8.2. Clean the threads of the bolt with denatured alcohol or equivalent and allow to dry.

8.3. Apply Threadlocker, GM P/N 89021297 (In Canada, use P/N 10953488).
Install the body mount bolts. Tighten
For 2003, 2004 and 2005 model year, tighten the bolts to 85 Nm (63 lb ft).
Tighten
For 2006-2008 model year, tighten the bolts to 100 Nm (74 lb ft).
Reinstall the intermediate park brake cable (left side only).

Parts Information

Part Number
Description
15899719
Insulator, Body
Warranty Information

For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
E9438*
Install Insulator to Body Mount (one side)
1.2 hrs**
Add
To Install Insulator to Additional Body Mount (opposite side)
0.6 hr
Add
To Install Insulator to Additional Body Mount (same side)
0.2 hr
* This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.
** This time includes diagnosis time.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
2009 General Motors Corporation. All rights reserved.

_____________________________________________
Dan

2004.5 CCSB 4wd LLY Duramax Diesel 17,500 lb recon winch, aFe mouthpiece, 5" MBRP straight pipe downpipe back, resonator plugged internally, spectre filter, airbox mod, Edge CTS w/lockpick reverse cam, PPE SS Tie Rod Sleeves, 17x9 procomp 7031's w/33.5x12x17 super swamper m16's

mig...tig...stick...any questions
lincolnmetal's welding learning center

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Old 07-21-2012, 06:37 AM   #2
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Thanks Dan! I think this is exactly what the issue is with my neighbors truck. His has the same clunk when he takes off from a stop and he's looked everywhere for the problem with no success. Sounds like he just needs some isolators

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Old 07-21-2012, 03:16 PM   #3
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check the torsion bar cross member bushing as well.

_____________________________________________
Dan

2004.5 CCSB 4wd LLY Duramax Diesel 17,500 lb recon winch, aFe mouthpiece, 5" MBRP straight pipe downpipe back, resonator plugged internally, spectre filter, airbox mod, Edge CTS w/lockpick reverse cam, PPE SS Tie Rod Sleeves, 17x9 procomp 7031's w/33.5x12x17 super swamper m16's

mig...tig...stick...any questions
lincolnmetal's welding learning center

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