4L60E, 4L65E Forward and Low Reverse Waved Steel Clutch Plate Appearance Change - kw appearance chatter first fourth PQC second shift shudder slip third transmission valve

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

The manufacturing process for the forward clutch waved steel clutch plate (648) and the low/reverse clutch waved steel clutch plate (682A) was changed approximately 11/01/03. Due to a new heat treating process, the forward waved clutch plate appears dark in color and looks as if it were overheated at one time. The low/reverse waved clutch plate appears dark and looks has if it were overheated at one time on the inner and outer edges.

The forward and low/reverse clutch waved steel clutch plates have changed in appearance only, due to a change in the manufacturing process. The functionality of the waved steel clutch is no different. These waved clutch plates will be used for both production and service.

.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(98 - 04 Chevrolet Silverado ) and (98 - 04 Chevrolet Tahoe ) and (98 - 04 Chevrolet Suburban ) and (02 - 04 Chevrolet Trailblazer ) and (98 - 04 Chevrolet Blazer) and (98 - 03 Chevrolet S-10) and (02 - 04 Chevrolet Avalanche) and (04 Chevrolet Colorado) and (98 - 04 Chevrolet Express ) and (98 - 04 Chevrolet Astro ) and (98 - 04 Chevrolet Corvette) and (98 - 02 Chevrolet Camaro) and (98 - 02 Pontiac Firebird) and (98 - 04 Cadillac Escalade) and (98 - 03 GMC Sierra) and (98 - 04 GMC Yukon) and (98 - 99 GMC Suburban ) and (00 -04 GMC Yukon XL) and (98 - 03 GMC Sonoma) and (98 - 03 GMC Jimmy) and (02 - 04 GMC Envoy) and (98 - 04 GMC Savana) and (04 GMC Canyon) and (98 - 04 GMC Safari) and (04 Pontiac GTO) and (03 - 04 Hummer H2) equipped with the 4L60E/4L65E

.