Noise Diagnosis - Rear Suspension

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, 2004 Chevrolet Cab & Chassis Silverado, and 2003 GMC Sierra. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
DEFINITION: Any noise emitted from the rear of the vehicle that is induced by VEHICLE SPEED or DRIVING TERRAIN as related to the rear suspension.
1	Did you review the General Description and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Suspension General Diagnosis
2	Attempt to duplicate the condition. Road test the vehicle. Did you duplicate the condition?	Go to Step 3	System OK
3	Is the noise reactive to vehicle load or speed?	Go to Step 4	Go to Step 6
4	Perform the following inspections: Inspect and adjust the tire inflation. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication. Inspect for unusual tire wear. Refer to Vibration Analysis - Tire and Wheel in Vibration Diagnosis and Correction. Inspect the wheel nuts for looseness. Refer to Fastener Tightening Specifications in Tire and Wheels. Did you find and correct the condition?	Go to Step 10	Go to Step 5
5	Inspect the rear axle for rear axle noises. Refer toSymptoms - Rear Drive Axle . Did you find and correct the condition?	Go to Step 10	Go to Step 6
6	Bounce the rear of the vehicle in order to duplicate the noise. Did you duplicate the noise?	Go to Step 7	Go to Step 9
7	Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Inspect the rear suspension components for looseness and tighten as necessary. Refer to Fastener Tightening Specifications in Rear Suspension. Inspect the rear suspension components for damage and repair as necessary. Did you find and correct the condition?	Go to Step 10	Go to Step 8
8	Inspect the rear shock absorber. Refer to Struts or Shock Absorbers On-Vehicle Testing . Did you complete the inspection?	Go to Step 10	Go to Step 9
9	Install the J 39570 chassis ear or equivalent. Bounce the rear of the vehicle, using the J 39570 or equivalent, in order to locate the source of the noise. If necessary, road test the vehicle. Repair or replace any defective component as necessary. Did you find and correct the condition?	Go to Step 10	System OK
10	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3