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

TRANSMISSION APPLICATIONS: SUBJECT: ------------------------- ------- 1987 THM 700-R4 (MD8) SLIPPING OR NO REVERSE/NO MANUAL 2-1 DOWNSHIFT--AFTER TRANSMISSION SERVICE - INFORMATION ON SERVICE PACKAGES WITH INCORRECT VALVE BODY AND CASE GASKETS

TRANSMISSION MODELS: VEHICLE APPLICATIONS: ------------------- -------------------- ALL MODELS 1987 B, F and Y Cars 1987 R, V, S and T Trucks 1987 G and M Vans 1988 C and K Trucks

Bulletin Covers:

A slipping or no reverse or a no manual 2-1 downshift condition which occurs after transmission service. Information regarding service package, part number 8657906, which may contain incorrect Valve Body and Case Gaskets.

SERVICE ACTION:

Service Package Number 8657906, containing both the Valve Body and Case Gaskets, may contain an interim design gasket that could cause the following operating concerns if installed onto any 1987 THM 700-R4 Transmission:

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

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

If Service Package No. 8657906 is used for any 1987 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 and return the package. Use Service Package No. 8657938 as listed under Service Parts Information.

SERVICE PARTS INFORMATION:

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.