Suspension - Squeak Noise from Rear of Vehicle
TECHNICALBulletin No.: 06-03-09-004E
Date: May 03, 2013
Subject: Squeak Noise from Rear of Vehicle (Lubricate Rear Leaf Springs)
Models:
1999-2007 Chevrolet Silverado (Classic)
2007-2012 Chevrolet Colorado
2007-2013 Chevrolet Silverado
1999-2007 GMC Sierra (Classic)
2007-2012 GMC Canyon
2007-2013 GMC Sierra
2007-2010 HUMMER H3, H3T
Supercede:
This bulletin is being revised to add the 2013 model year. Please discard Corporate Bulletin Number 06-03-09-004D (Section 03 - Suspension).
Condition
Some customers may comment about a squeak noise coming from the rear of the vehicle. During normal operation, certain vehicles may exhibit a squeaking noise that may be traced to the rear leaf springs. While this noise is an operating characteristic of leaf springs, the frequency and severity of this noise will be affected by the roads that the vehicle is driven on.
Cause
This condition may be due to debris getting between the leaf springs.
Correction
To correct this condition, lubricate the rear leaf springs using the following procedure.
Important
It has been found that the application of grease to the rear leaf springs does a better job of preventing the noise from reoccurring than replacement of the spring.
1. Raise the vehicle on a frame lift-type hoist.
2. Inspect the springs for damage. If none is found, proceed to the next step.
3. Pressure wash the rear leaf springs to remove as much dirt and grit as possible.
4. Dry the springs with compressed air.
Note
Ensure any tool used to gently pry the tip inserts or spring leaves is protected to prevent damage to the spring leaves.
5. Apply a liberal amount of grease, P/N 12345996 (in Canada, use P/N 10953501), both underneath and on top of the front and rear tip inserts for the # 2 and # 3 leaves, as indicated below. A screwdriver can be used to gently pry up the tip insert; however, a rag around the screwdriver must be used to prevent damage to the spring. Use a flat-bladed tool, such as a gasket scraper to properly distribute the grease.
6. Lower the vehicle to the ground and test drive to verify the repair.
Please inform the customer that this will offer relief, but is not a lifetime repair. Periodic cleanings and grease re-application may be necessary throughout the life of the vehicle.
For 1500 Series (1/2 ton) models only: On vehicles built prior to October 2004, if the above procedure does not correct this noise, it could be caused by an incorrectly dimensioned splay clip (the band holding the ends of the leafs together) that interferes with the leaf springs. A 5 mm (0.197 in) wider splay clip was introduced in early 2005 model year to provide additional clearance. To correct this concern, replace the rear leaf spring assembly. There was no change to the part number.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
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