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#1
01-03-2004, 02:15 PM
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4WD Noise
have a '02 Sierra Z71. There is a very noticable "noise" when turning the wheel in 4WD. Sounds like a grinding noise. Not sure where coming from. Have taken it back to the dealer and they tell me it's "normal". They don't know what it is. I've owned other 4X4's and never had this problem. I'm not satisfied with the it's normal diagnosis. If it is normal what is the cause of this noise. Warranty is almost up and want a solution before I have to pay. Thanks for any info.
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#2
01-04-2004, 08:31 AM
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Re: 4WD Noise
Here is a bulletin that may or may not apply....
What kind of noise are you hearing? Slips in 4-Wheel Drive, Noise, Vibration, Leaks, Hot Odor (Diagnose and Repair Front Differential and/or Transfer Case) #02-04-21-005A - (02/11/2003) Slips in 4-Wheel Drive, Noise, Vibration, Leaks, Hot Odor (Diagnose and Repair Front Differential and/or Transfer Case) 1999-2000 Cadillac Escalade 1998-2002 Chevrolet S-10, Silverado, Blazer, Suburban, Tahoe 2002 Chevrolet Avalanche 1998-2002 GMC Sierra, Sonoma, Jimmy, Suburban, Yukon, Yukon XL with Autotrak Transfer Case (RPO NP8) (Selector Pad on Instrument Panel Must Have Auto 4WD, 4HI, 4LO, and 2HI Selections) This bulletin is being revised to incorporate changes to the diagnostic procedure. Please discard Corporate Bulletin Number 02-04-21-005 (Section 04 -- Driveline Axle). Condition Some customers may comment on any of the following conditions: Slips in 4WD Noise Vibration Leaks Hot odor Cause The front axle may have excessive preload in the pinion or carrier bearings or may be locked up not allowing the pinion to rotate freely. Vehicles with a NVG 236 or 246 transfer case (RPO NP8) have a preload in the clutch pack of the transfer case that supplies torque to the front driveshaft at all times. The front and rear driveshafts should be rotating at approximately the same speed (the front driveshaft display on the Tech 2® may be slightly higher but never less than the rear).
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