SLIP, NO REVERSE OR NO MANUAL 2-1 DOWNSHIFT AFTER TRAN.

Model and Year: 1987-88 PASSENGER CARS AND TRUCKS WITH THM 700-R4 TRANSMISSIONS

Service package P/N 8657906, containing both the Valve Body and Case Gaskets, may contain an interim design gasket that could cause the following operating characteristics if installed in any 1987-88 THM 700-R4 Transmission:

1. Slipping or no reverse - If installed into a 1987-88 THM 700-R4 transmission without an Auxiliary Valve Body.

2. No manual 2-1 downshift - If installed into a 1987-88 THM 700-R4 transmission with an Auxiliary Valve Body.

If Service Package P/N 8657906 is used for any 1987-88 THM 700-R4 transmission, first verify that it has the correct Valve Body and Case Gaskets (refer to Figure 1). If the holes identified as 1, 2 and 3 are not visible or are not in the correct location, do not use it and return the package to G.M.S.P.O. Use Service Package P/N 8657938 instead.

8657938 pkg. - Spacer Plate Gaskets

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.