This bulletin is being revised to update the Warranty information. Please discard Corporate Bulletin Number (Section Suspension).

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Kellie Lawson
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1 1 of 3 8/6/2011 9:07 PM 2004 Chevrolet TrailBlazer - 4WD Bravada, Envoy, Rainier, TrailBlazer VIN S/T Service Manual Document ID: Subject: Models: Rattle, Clunk, Pop, Snap Noise from Front and/or Rear Suspension While Driving Over Rough, Uneven, Wash Board Road Surfaces (Replace Appropriate Stabilizer Link(s)) 2004 Buick Rainier Chevrolet TrailBlazer Models GMC Envoy Models Oldsmobile Bravada This bulletin is being revised to update the Warranty information. Please discard Corporate Bulletin Number (Section Suspension). Condition Some customers may comment on a rattle, clunk, pop, loose lumber-type noise coming from the front and/or rear suspension while driving over rough, uneven roads. Cause The front and/or rear stabilizer links may develop additional clearance in the ball joint links, leading to a noise concern. Correction Road test the vehicle and verify if the noise is coming from the front or rear, left or right of the vehicle. It is possible in some circumstances that the noise may be coming from the front and rear suspension. Once it is determined that the noise is coming from the front or rear, left or right of the vehicle, raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID # ). Caution: DO NOT DRIVE the vehicle on highways or at a high rate of speed while the stabilizer link(s) are removed/disconnected from the vehicle. ONLY test drive the vehicle in a parking lot or on a side street. Driving the vehicle with the link(s) removed/disconnected may reduce vehicle stability. Remove or disconnect the suspect stabilizer link(s) from the appropriate stabilizer shaft and re-road test the vehicle with the links disconnected to verify the source of the noise. If the noise is still present with the suspect link(s) removed, the source of the noise is NOT the stabilizer links. Refer to the information below for diagnostic assistance General Motors. All rights reserved.

2 2 of 3 8/6/2011 9:07 PM - Service Bulletin -- Rattle From Front of Vehicle (Adjust Hood Latch Following New Procedure) # or newer (SI Document ID # ) - Service Bulletin -- Rattle Noise Under Hood (Reposition Hood Prop Rod) # or newer (SI Document ID # ) - Service Information -- Suspension - Suspension General Diagnosis in the appropriate SI Document. 4. If the noise is no longer present with the suspect stabilizer link(s) removed, continue with the next step. Replace the suspect stabilizer link(s) (see parts information below). Refer to the appropriate Service Information for the replacement procedure. Parts Information Part Number Description Qty LINK, FRT STAB SHF (07.240) - LH (INCLS 11) (2004 MY) LINK, FRT STAB SHF (07.240) - RH (INCLS 11) (2004 MY) LINK KIT, RR STAB SHF (07.240) - RH ST158, ST155 ( MY) LINK KIT, RR STAB SHF (07.240) - LH ST158, ST155 ( MY) LINK KIT, FRT STAB SHF (INCLS 11) LH (W/NUT) ( MY) LINK KIT, FRT STAB SHF (INCLS 11) RH (W/NUT) ( MY) 1

3 3 of 3 8/6/2011 9:07 PM E4171 Link Assembly, Rear Stabilizer Shaft - Left - Replace Use Published Labor Operation Time E9470* Link or Bushings, Front Stabilizer Shaft At Control Arm - Both - R&R Or Replace 0.6 hr E9472* Link Assembly, Rear Stabilizer Shaft - Both - Replace 0.4 hr *This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide.

4 D 1 of 2 8/6/2011 9:10 PM 2004 Chevrolet TrailBlazer - 4WD Bravada, Envoy, Rainier, TrailBlazer VIN S/T Service Manual Suspension Rear Suspension Repair Instructions Document ID: Removal Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Remove the stabilizer shaft link retaining nuts. Notice: Do not pry on the stabilizer shaft link. Use care when removing or installing the stabilizer shaft link in order to avoid tearing or puncturing the stabilizer shaft link boot. Damage to the stabilizer shaft link boot will lead to damage to the stabilizer shaft link. 4. Disconnect the stabilizer shaft link from the frame. Disconnect the stabilizer shaft link from the stabilizer shaft and remove the stabilizer shaft link. Installation Procedure

5 of 2 8/6/2011 9:10 PM Connect the stabilizer shaft link to the stabilizer shaft and to the frame. Notice: Refer to Fastener Notice in the Preface section. Install the stabilizer shaft link retaining nuts. Tighten Tighten the stabilizer shaft nuts to 100 N m (74 lb ft). Lower the vehicle.

Some customers may comment that the Service 4WD light is on, the 4WD system is inoperative or the 4WD switch indicator lights are blinking.

Some customers may comment that the Service 4WD light is on, the 4WD system is inoperative or the 4WD switch indicator lights are blinking. #04-04-21-004: 4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, C0550 Set (Replace Transfer Case Encoder Sensor, Reprogram TCCM) - (Dec 16, 2004) Subject: 4WD Switch Indicator Lights