NEW FORWARD SPRAG CLUTCH PRODUCTION CHANGE/SERVICE P/N

Models: 1982 C-K Trucks with THM 700-R4 Transmission

Beginning May 3, 1982, a new forward sprag clutch entered production replacing the forward roller clutch on all 700-R4 transmissions (Figure No. 1).

The forward sparg clutch will be serviced as a kit for all transmissions built prior to May, 1982. The conversion kit, P/N 8642947, will consist of:

a. Snap ring - overrun clutch hub b. Overrun clutch hub c. Wear plate d. Forward sprag clutch assembly e. Retainer and race assembly f. Forward sprag outer race g. Input sun gear assembly h. input carrier assembly i. Thrust washer j. Instruction sheet

The following individual part numbers can be used to service all transmissions which have a forward sparg clutch or have been converted.

8647083 Snap ring overrun clutch hub 8647082 Overrun clutch hub 8647081 Wear plate 8647084 Forward sprag clutch assembly 8647085 Retainer and race assembly 8647090 Forward sprag outer race 8647093 Input sun gear assembly 8647050 Input carrier assembly 8647095 Thrust washer

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.