K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Some 1988-92 vehicles with HYDRA-MATIC 4L60/700R4 transmissions may exhibit a clicking or whining noise in third and fourth gear. A customer
may also describe it as a ticking or rattle noise from the rear of the transmission. The clicking noise is caused by transmission fluid passing over the
friction plates of the low and reverse clutch. The fluid causes them to vibrate when the low and reverse clutch is not applied (third and fourth gear).
SERVICE PROCEDURE
Install five new fiber plates in the low and reverse clutch. The new plates have a different groove configuration so they don't vibrate in third and fourth
gear.
DATE OF PRODUCTION CHANGE
The new low and reverse fiber clutch plates were phased into production over several weeks as sufficient stock became available. Beginning February
20, 1992 (Julian Date 051) all HYDRA-MATIC 4L60 transmissions were built using the new fiber clutch plates.
SERVICE PARTS INFORMATION
Part
Number
Description
8681813
Plate, Low and Reverse Clutch (Fiber)
