ALL 1982-1985 LIGHT DUTY WITH 700-R4 AUTOMATIC TRANSMISSIONS
Effective with the start of production of the 1985 THM 700-R4 transmission, ALL MODELS are being built with thicker steel clutch plates and thinner composition clutch plates in the forward clutch assembly.
The thickness change in the plates does not affect the overall "Stack Up" dimension for the forward clutch assembly when used in sets as shown below. Do not mix the new plates with plates for transmissions built prior to the 1985 model year.
Your parts catalog should reflect information contained in the chart below.
1982-1984 Forward Clutch Plate(Fiber) 2.03mm(.079") 8647350
1982-1984 Overhaul Kit 8642991
1985 Forward Clutch Plate(Steel) 2.29mm(.090") 8654325
1985 Forward Clutch Plate(Fiber) 1.78mm(.070") 8654324
1985 Overhaul Kit 8647980
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.