3RD GEAR 'HOP-OUT' ON ACCELERATION OR DECELERATION

MODELS: 1985-86 C/K, R/V, P MODELS WITH HM 117 (RPO M20) OR CH/SM 465 (RPO MC8) MANUAL TRANSMISSION

BULLETIN COVERS

Above vehicles may exhibit 3rd gear hop-out on acceleration or deceleration.

DATE OF PRODUCTION CHANGE

December 15, 1987 (Julian Date T15)

SERVICE ACTION

If 3rd gear hop-out occurs, it can be repaired by installing the service part package listed below.

SERVICE PARTS INFORMATION

P/N 8672944 Service Part Package contents:

Quantity Part Description

1 3rd Speed Gear 1 3rd-4th Synchronizer Hub 1 3rd-4th Speed Synchronizer Sleeve 2 3rd and 4th Speed Blocker Rings 3 Synchronizer Keys 2 Synchronizer Springs

SERVICE NOTE

Refill the transmission with only SAE 8OW-90 gear lubricant. Do not use automatic transmission fluid or engine oil, which can cause foaming out the vent and durability concerns.

SERVICE MANUAL REFERENCE

Refer to the Unit-Repair Section of the appropriate Service Manual for service procedures.

LABOR OPERATION:

K2700 Transmission Assembly - R & R Transmission, recondition mainshaft.

1988 1985-86 1987-88 1985-88 C K C K R V P - - - - - - - 2.8 3.5 3.6 4.1 3.6 4.1 3.6

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.