Ok so I have read similar post but nothing definative maybe in part becasue responses dryed up on the posts I dont know but maybe someone can help. I was turning left at a light at low speed and the truck started to clunk and shake slightly with every clunk. I slowed down and the sound and shaking would slow down. I applied more pressure to the fuel pedal and the issue would continue. I slowed down again and the same issue just slowing down. After I straightened out the wheel to complete my turn it went away. It has happened once again after words and my wife said it has happened to her in the past also when turning:confused: but I don't know what it could be. I recently changed my front and rear fluids to Amsoil and the first time it happened as I wrote above I was actually returning home from Krapen from turning in my old front and rear fluids. Im lost so any insight will help. I do have the G80 rear and the road was dry. Thanks lots in advance.

I had a similar issue from the front, my clunk turned out being Ball joints. I am in the process of replacing LF CV Axle as well, there was a bit of play up and down in the CV, hopefully that along with the Ball Joints will fix my situation. You don't indicate if your noise was from the front or rear, if the front you might take a look at these......

Body mounts, tsb around here somewere.

I had a similar issue from the front, my clunk turned out being Ball joints. I am in the process of replacing LF CV Axle as well, there was a bit of play up and down in the CV, hopefully that along with the Ball Joints will fix my situation. You don't indicate if your noise was from the front or rear, if the front you might take a look at these......
Sorry but I'm not completely sure but it almost feels like the front end. The truck only has around 15,600 mi could it be the ball joints already:confused:? Thanks for the reply's I might have to take it to the stealer for warranty then.

Body mounts, tsb around here somewere.
You think it could be body mounts??

You think it could be body mounts??


Document ID: 2050748

#06-08-61-003B: Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator) - (Jan 22, 2008)
http://gsi.xw.gm.com/image_en_us/gif/000/999/999/999999995.gif
Subject:Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator)
Models:2004-2006 Cadillac Escalade, Escalade ESV, Escalade EXT

2004-2006 Chevrolet Avalanche, Suburban, Tahoe

2004-2007 Chevrolet Silverado (Classic)

2004-2006 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

2004-2007 GMC Sierra, Sierra Denali (Classic)

2003-2008 HUMMER H2


This bulletin is being revised to add the 2008 HUMMER H2. Please discard Corporate Bulletin Number 06-08-61-003A (Section 08 - Body and Accessories).

Condition

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss1-2050748)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

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss2-2050748)Under certain conditions, normal movement between the frame and body mount may cause this noise to occur.
Correction

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss3-2050748)Install an insulator at the right and left side #1 body mounts. 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. 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 mount 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 #1 body mount area.
http://gsi.xw.gm.com/image_en_us/gif/000/000/800/800067.gif
http://gsi.xw.gm.com/si/images/tif.gif (http://gsi.xw.gm.com/si/showTif.do?image=800067)
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 #1 body mount.Important: While the body mount is removed, check the underbody area that interfaces with the top of the body mount for excess build-up of E-Coat Primer or other foreign material. If the surface is not smooth use a 90 degree die grinder, or equivalent to remove the excessive build-up. Apply an anti-corrosion protection, P/N 12378398 (in Canada, 10952414), to the bare surface as necessary to prevent rusting.

http://gsi.xw.gm.com/image_en_us/gif/000/001/848/1848439.gif
http://gsi.xw.gm.com/si/images/tif.gif (http://gsi.xw.gm.com/si/showTif.do?image=1848439)
Install the new insulator to the bottom of the top portion of the #1 body mount. The picture shows the insulators (1) location after the body mount is reassembled.
Install the #1 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 N·m (63 lb ft).
Tighten
For 2006-2008 model year, tighten the bolts to 100 N·m (74 lb ft).
Reinstall the intermediate park brake cable.
Repeat steps 3-9 for the other side.
Test drive the vehicle to verify the repair.Parts Information

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss4-2050748)Part Number
Description
Qty
15899719
Insulator, Body
2
Warranty Information

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss5-2050748)For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
E9438*
Install Insulator to #1 Body Mount
1.7 hrs
* This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.
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.

Sounds like intermediate steering shaft problems to me. Had same problem and replaced shaft and bearing. Problem solved. Go to partszoneonline to order GM parts.

Thanks for the TSB and the replies. I called stealer and will be taking her in on Monday morning. She under warranty so hopefully nothing out of pocket. I will post back with the results. Thanks again. Have a safe weekend.

Document ID: 2050748

#06-08-61-003B: Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator) - (Jan 22, 2008)
http://gsi.xw.gm.com/image_en_us/gif/000/999/999/999999995.gif
Subject:Underbody Pop or Clunk Type Noise While Turning or Driving on Uneven Road Surfaces (Install Body Mount Insulator)
Models:2004-2006 Cadillac Escalade, Escalade ESV, Escalade EXT

2004-2006 Chevrolet Avalanche, Suburban, Tahoe

2004-2007 Chevrolet Silverado (Classic)

2004-2006 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

2004-2007 GMC Sierra, Sierra Denali (Classic)

2003-2008 HUMMER H2


This bulletin is being revised to add the 2008 HUMMER H2. Please discard Corporate Bulletin Number 06-08-61-003A (Section 08 - Body and Accessories).

Condition

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss1-2050748)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

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss2-2050748)Under certain conditions, normal movement between the frame and body mount may cause this noise to occur.
Correction

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss3-2050748)Install an insulator at the right and left side #1 body mounts. 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. 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 mount 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 #1 body mount area.
http://gsi.xw.gm.com/image_en_us/gif/000/000/800/800067.gif
http://gsi.xw.gm.com/si/images/tif.gif (http://gsi.xw.gm.com/si/showTif.do?image=800067)
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 #1 body mount.Important: While the body mount is removed, check the underbody area that interfaces with the top of the body mount for excess build-up of E-Coat Primer or other foreign material. If the surface is not smooth use a 90 degree die grinder, or equivalent to remove the excessive build-up. Apply an anti-corrosion protection, P/N 12378398 (in Canada, 10952414), to the bare surface as necessary to prevent rusting.

http://gsi.xw.gm.com/image_en_us/gif/000/001/848/1848439.gif
http://gsi.xw.gm.com/si/images/tif.gif (http://gsi.xw.gm.com/si/showTif.do?image=1848439)
Install the new insulator to the bottom of the top portion of the #1 body mount. The picture shows the insulators (1) location after the body mount is reassembled.
Install the #1 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 N·m (63 lb ft).
Tighten
For 2006-2008 model year, tighten the bolts to 100 N·m (74 lb ft).
Reinstall the intermediate park brake cable.
Repeat steps 3-9 for the other side.
Test drive the vehicle to verify the repair.Parts Information

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss4-2050748)Part Number
Description
Qty
15899719
Insulator, Body
2
Warranty Information

(http://gsi.xw.gm.com/si/showDoc.do?docSyskey=2050748&bulletinNbr=06-08-61-003B&from=ns&name=Underbody+Pop+or+Clunk+Type+Noise+While+Turni ng+or+Driving+on+Uneven+Road+Surfaces+%28Install+B ody+Mount+Insulator%29&releaseDate=2008-01-22#ss5-2050748)For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
E9438*
Install Insulator to #1 Body Mount
1.7 hrs
* This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.
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.

Just noticed that this does not list NBS 2008 Sierra or Silverado. Is there another TSB for NBS? I will search the forum I suppose. Thanks.

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

--------------------------------------------------------------------------------


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 N·m (63 lb ft).
Tighten
For 2006-2008 model year, tighten the bolts to 100 N·m (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.

Ok so I called the dealer this morning to see if they were busy and they were. Maybe because it was MLK day so I decided to take it Tuesday when hopefully it will be less crowded.

Keep us updated so we can all learn from your issue.

Sounds like the rear end locker was engaged when you were turning. My 08' has done the same thing.

Sounds like the rear end locker was engaged when you were turning. My 08' has done the same thing.
If it is the locker there should be a TSB because it does not sound right. It makes me cringe when it does happen.

From your original entry, I gather that the sound/clunking has only happened twice. My 08' did the sound/clunking twice, while making two left hand turns. It sounds, as if, very similar to yours.
Just prior to the sound/clunking and during the same driving period, I had spun a tire due to wet road conditions. I felt the locker engage when the tire spun. The next two left turns is when the sound/clunking was noticed. After parking the truck, due to arriving at my destination, the sound/clunking has not happened again.
Keep us posted if you do bring it in to the dealer.

O.k so I went to the dealer but I could not replicate the problem. The mechanic that rode with me said it possibly in part to the extreme wet weather we are having and the tire is just sliding across the pavement on the turn and not griping enough to replicate. I was told to return when the weather let up and that they would keep the RO open until the issue was resolved. Frustrating but will just have to wait until weather lets up.:(

From your original entry, I gather that the sound/clunking has only happened twice. My 08' did the sound/clunking twice, while making two left hand turns. It sounds, as if, very similar to yours.
Just prior to the sound/clunking and during the same driving period, I had spun a tire due to wet road conditions. I felt the locker engage when the tire spun. The next two left turns is when the sound/clunking was noticed. After parking the truck, due to arriving at my destination, the sound/clunking has not happened again.
Keep us posted if you do bring it in to the dealer.

I told the mechanic that it is probably the locker trying to engage and he said it could but that it could also be the transfer case or knuckles, or some other drive line component. I'm pleased he did not jump to this conclusion simply because I mentioned it . Being a master mechanic with 30yrs under his belt I'm sure he knows better than that.:D:beerchug:

Sorry for the delay. I have not forgotten to update the post. I have not taken the truck to the dealer yet but I should be on Tuesday hopefully. I will keep everyone updated. Sorry once again.

Thanks Sarge!

Ok, So I finally took the truck to the dealer and I still was not able to replicate the problem. Myself and the mechanic took a 1hour ride trying to replicate it but nothing:confused:. The truck has not done this again either so that's a good thing :)but its still in the back of my mind:(. I will still update the post as things happen.

i know this is an old post but my truck has done this as well with the rear end. I have an 06 2wd so it cant be something to do with the front drivetrain or trasfer case. It just seems as the locker is trying to lock but not succeeding. Try this... in an open area of course... from a dead stop floor it till it almost shifts to 2nd then hit the brakes hard as soon as you stop to a normal left turn and it comes back. At least thats when it happens for me or when im driving like a maniac it does it as well :)

Mine just did this today and scared the CRAP out of me, I thought for sure it was a rock or something in the front wheel hub. Rolled straight for a few minutes and all went away. Drove around all seemed great, not sure what the deal was, after reading this, it would seem a ratcheting of the G80 would fit...

HMM, did you have any luck with your root cause?

To the original poster...
That sounds like the Intermediate Steering Shaft/ Steering column bearing. (If you haven't resolved the issue yet, I realize this post is old.)
DisguisedSS,
The truck pulls hard to one side while braking?

This issue has not returned. I'm still confused as to what caused it. Maybe it was the G80 locking up. I don't know. I have checked and re-checked every possible area mentioned by all you, but I can't find the possible cause.