GM Customer Care and Aftersales
*URGENT - DISTRIBUTE IMMEDIATELY*
DATE: November 4, 2010
SUBJECT: Do Not use Slip Yoke Grease from Bulletin #09-04-17-002C on 4WD Vehicles.
MODELS: 2007 – 2009 Chevrolet Silverado 1500 Series
2008 – 2009 Chevrolet Avalanche, Suburban, Tahoe 1500 Series
2007 – 2009 GMC Sierra 1500 Series
2008 – 2009 GMC Yukon, Yukon XL 1500 Series
Equipped with 4WD (RPO NQG, NQH)
TO: Chevrolet/GMC Dealers
ATTN: Service Manager and Parts Manager
A new grease, part # 19257121 (in Canada, 19257122), was recently released for lubrication of slip yoke splines to repair a condition of a bump feel or clunk noise at stop or from launch on the vehicles equipped with 4L60 Automatic Transmission (RPO M30) and 2WD. Please see Bulletin # 09-04-17-002C for details.
Do not use the new grease for lubrication of slip yoke splines on 4WD vehicles. The output shaft in a 4WD transfer case does not have a grease retainer to keep the grease from migrating into the transfer case and mixing with the fluid inside. The new grease is not compatible with the Automatic Transmission fluid used in the transfer case and can cause damage if mixed. Lubricate the splines on 4WD vehicles with Automatic Transmission Fluid, P/N 88861003 (in Canada, 88861004). Please refer to Bulletin # 09-04-21-003B for repairing the bump feel or clunk noise condition on 4WD vehicles.