This bulletin is being revised to provide information for identifying '06-'08 Impala I-shafts that have been produced using the new production process. Regal, Impala, Monte Carlo, Intrigue and Grand Prix vehicles ONLY -- continue to grease the I-shaft. For Allure and LaCrosse, continue to replace the intermediate shaft as necessary.
Please discard Corporate Bulletin Number 01-02-32-001K (Section 02 -- Steering).
Some customers may comment on a clunk type noise coming from the front of the vehicle while driving during a turning maneuver. This condition may also be felt through the steering wheel when the vehicle is stationary and the wheel is rotated from steering stop to steering stop. Some vehicles may only exhibit the noise once for every 360° of wheel rotation. On all other vehicles, this clunk noise will be noticed during low speed acceleration or deceleration, typically in light turns of the steering wheel or when applying/releasing the brakes.
This condition may be caused by a "slip stick" condition resulting in the clunk noise or feel through the steering wheel.
Important: This condition is commonly misdiagnosed as originating in the steering gear and has resulted in the replacement of numerous steering gears without correcting the concern.
Attempt to duplicate the customer's concern and isolate the I-shaft by following the procedure below:
DON'T DO THIS
Replace the intermediate shaft.
DO NOT lube the intermediate shaft.
Replace the existing intermediate shaft using the service procedure found in Service Information.
Important: 2006-2008 Chevrolet Impala ONLY -- intermediate shafts with a Julian date of 200 or higher, were produced using the new process. (Refer to diagram below showing where to locate the 5-digit Julian date on the label). Only use I-shafts with Julian dates of 200 or higher.
If the vehicle is equipped with the new design I-shaft -- grease the intermediate shaft.
If the vehicle is equipped with the previous (old) design -- exercise/stroke the shaft to redistribute the existing grease.
DO NOT replace the intermediate shaft.
For vehicles equipped with the old designed I-shafts which are already greased, remove the I-shaft from the vehicle. Exercise/stroke the intermediate shaft to redistribute the existing grease on the shaft.
If the vehicle is equipped with a non-greased intermediate shaft, remove the intermediate steering shaft from the vehicle. Lubricate the shaft using the steering column shaft lubrication kit, P/N 26098237, using the following procedure:
Important: Make sure the intermediate shaft is being pressed over the ears of the solid shaft.
Important: Before installing the intermediate shaft in the vehicle, make sure to stroke and extend the intermediate shaft at least 15 TIMES to completely lubricate the internal surface of the slip joint.
Shaft -- Steering Gear Coupling
Shaft Asm - Steering Gear
(06-07 Allure/LaCrosse built after January 1, 2006)
Shaft Asm - Steering Gear
(05-06 Allure/LaCrosse built prior to January 1, 2006)
Steering Column Shaft Lube Kit (for the remaining vehicles in the bulletin)
For vehicles repaired under warranty, use:
Shaft, Steering Intermediate - R&R
Use Published Labor Operation Time
Lubricate Steering Shaft