Clunking When Rolling Over Bumps

strafingmoose · July 23, 2008

Hi there!

I hear a "clunking" when rolling over bumps. I only hear it when the windows are open. It doesn't have a grinding tone like something about to break, and its always the same sound (not degenerating).

I heard you have to add some rubber washers somewhere to muffle it a bit.

Any thoughts ?

Thanks.

jrrod2004 · July 24, 2008

Hi there!

I hear a "clunking" when rolling over bumps. I only hear it when the windows are open. It doesn't have a grinding tone like something about to break, and its always the same sound (not degenerating).

I heard you have to add some rubber washers somewhere to muffle it a bit.

Any thoughts ?

Thanks.

It might be that, it also might be the crossmember. I had the same problem and the dealer fixed it....I would have to pull the old records to find out what it was that they fixed

jrrod2004 · July 24, 2008

This is what was replaced:

11/27/2007 851 02 # E8041 - TIE ROD, INNER - LEFT - REPLACE 19152329 - ROD KIT

11/27/2007 851 05 # E7700 - SHAFT, STEERING INTERMEDIATE - REPLACE 19153614 - SHAFT

11/27/2007 851 09 # E1730 - CROSSMEMBER, FRONT SUSPENSION - REPLACE 11509592 - WASHER

but mine is a 2WD, not sure if yours is a 4WD so this may or may not apply

jrrod2004 · July 24, 2008

Service Information

2006 Chevrolet Chevy C Silverado - 2WD | Sierra, Silverado (VIN C/K) Service Manual | View All Bulletins | Document ID: 2006229 #03-08-61-002I: Snap/Popping Type Noise Coming From Front of Vehicle (Remove Bolt-In Front Crossmember and Add Washers) - (Aug 27, 2007)

Subject:Snap/Popping Type Noise Coming from Front of Vehicle (Remove Bolt-In Front Crossmember and Add Washers)

Models:2003-2006 Cadillac Escalade

2003-2006 Chevrolet Avalanche, Suburban, Tahoe

2004-2007 Chevrolet Silverado (Classic)

2003-2006 GMC Yukon, Yukon XL

2004-2007 GMC Sierra (Classic)

2003-2008 HUMMER H2

1500 Series (½ Ton) and 2500 Series (¾ Ton) with Two-Wheel Drive

Attention: This bulletin only applies to 1500/2500 Series 2WD and HUMMER H2 vehicles with recirculating ball type steering.

This bulletin is being revised to update the parts information to include a new washer for HUMMER H2. Please discard Corporate Bulletin Number 03-08-61-002H (Section 08 -- Body and Accessories).

Condition

Some customers may comment on a snap or popping-type noise coming from the front of the vehicle. This condition is most apparent during hard left or right turns at low speeds. Going over bumps while turning may also aid in producing this noise.

Correction

Remove the bolt-in front crossmember and add washers using the procedure listed below.

Important: DO NOT slot the mounting holes on the crossmember as stated in previous bulletins. Slotting the holes has been found to be less effective and, in some cases, causes the noise condition to be more prevalent.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Remove the mounting nuts, bolts and the front crossmember from the vehicle.
Clean all the undercoating off the crossmember in the area of the mounting holes.
Reinstall the crossmember with the bolts and nuts. On the driver and passenger side, add washer P/N 11509592 (C/K models) or P/N 15567836 (H2), or equivalent hardened washer (see dimensions below), at each bolt head and nut location.Tighten
Tighten the bolts to 120 N·m (89 lb ft).
Apply an even coat of Anti-Corrosion Coating, P/N 12346501 (in Canada, 10952414), or equivalent, to the crossmember where removed. Overlap the original coating in order to provide an effective corrosion protection.

C/K Models

Inside Diameter

Outside Diameter

Thickness

14 mm (0.551 in)

35 mm (1.38 in)

3 mm (0.118 in)

H2

Inside Diameter

Outside Diameter

Thickness

14 mm (0.551 in)

24 mm (0.945 in)

3 mm (0.118 in)

Parts Information

Part Number

Description

Qty

11509592

(C/K Models)

Washer

8

15567836

(H2)

Washer

8

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

E1730

Crossmember, Front Suspension - Replace

Use Published Labor Operation 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

strafingmoose · July 24, 2008

Hey thanks for the info Mike

Yes, my truck is a RWD and forgot to mention, the noise comes from the rear.

iminaquagmire · July 25, 2008

Do you have a hitch in the receiver? Mine clunks around in the receiver and its quite loud actually. Not saying there isn't something wrong but check the little things first. I know I was convinced there was something wrong when I first heard it. Same when the squeaking noise I heard was actually my aftermarket exhaust's hanger.

chris_kucia · July 25, 2008

I have a similar problem on mine.

I've been putting a fair amount of time into the truck tracking down squeaks and clunks. Now that I've fixed the major stuff, I've noticed there's some clunkingrattling in back going over potholes, speedbumps and the like.

Previously, my tailgate strikers had worn rubber which I replaced with some nylon bushings from Home Depot. That, and some adjustment to the hinges took most of the slop and rattling from tailgate.

Next place I'll be looking is the spare tire to be sure its retained properly.

Other things I'll be looking for are worn exhaust bushings, loose or worn shocks, leaf spring bushings and the like.

Might want to verify the bed bolts are tight too.