TCC SHIFT VALVE TRAIN SERVICE MANUAL UPDATE THM700R4

VEHICLES AFFECTED: THM 700-R4 Transmission Codes YK, YT, YX, YP, YZ, YC, PR, MT, VC, PO, YN, YA

At the start of production of the 1985 THM 700-R4 transmission, the converter clutch shift valve train was eliminated on vehicles that have T.C.C. apply controlled by the E.C.M. Use drawings in Figures 1, 2 and 3 to update your 1985 Service Manual.

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.