SLIP OR LOSS OF DRIVE NEW SPRAG RACE AND HUB ASSY.. Chevrolet Chevy C Pickup

MODEL AND YEAR: 1982-86 PASSENGER CARS AND TRUCKS WITH THM 700-R4 TRANSMISSION

This bulletin cancels and supersedes Chevrolet Dealer Service Bulletin 86-124 (Section 7A) dated July, 1986. All copies of 86-124 should be discarded. New sprag, race, and hub assemblies are available for use when servicing 1982-86 THM 700-R4 transmissions.

Slipping or loss of drive range condition on a 1982 through 1986 THM 700-R4 transmission may be caused by latching (chatter marks) of the forward clutch sprag assembly. This condition can result in belling or flaring of the reverse input housing and reaction sun shell. A new sprag, race and hub assembly is used in production and available for service.

July 17, 1986, Julian Date 198 (refer to figure 1) a new sprag, race, and hub assembly was introduced for all 1987 THM 700-R4 transmission models, including 1987 Service Replacement Transmission Assemblies (SRTA).

NOTE: When using the new sprag, race, and hub assembly, the sprag assembly wear plate (640) and the input carrier to race thrust washer (660) must be removed and not replaced (refer to Figure 2).

PARTS INFORMATION

APPLICATION PART NAME PART NUMBER ----------- --------- ----------- Corvette-All Sprag, Race, Hub Assy 8663773 Camaro 5.OL/5.7L Sprag, Race, Hub Assy 8663773 All other models Sprag, Race, Hub Assy 8663774

Object Number: 79327 Size: FS

Object Number: 78157 Size: FS

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.