HARSH 2-1 DOWNSHIFT DELAYED DOWNSHIFT INFORMATION

"Please discard previous bulletin 83-T-64 with above title due to revised part numbers and model identification. "

Starting March 25, 1983, (Julian date 084), all THM 700-R4 transmissions were built using a new control valve assembly and spacer plate to correct a harsh manual 2-1 downshift feel and/or delayed downshift condition.

When servicing any 1982 or 1983 THM 700-R4 transmission for a harsh manual 2-1 downshift feel and/or a delayed downshift, the T.V. limit plug, gasket-(spacer plate to case), gasket-(spacer plate to valve body), and spacer plate, must be replaced to correct this condition. (See Figure 1 for installation of the T.V. limit plug.)

PART NAME PART NO. IDENTIFICATION 1982 1983

1. T.V. limit plug 8647453 8647453 -

2. Gasket-spacer plate to case. 8642993 8642974 - Gasket-spacer plate to valve body. 8642993 8642974 -

3. Spacer plate (9M2, 9M4, 9M5, 8647455 8647455 "D" 9M7,9MB, 9MC, 9MD, 9ME, 3Y2,3VA, 3YK)

4. Spacer plate (9YA, 9Y6, 3YH, 8654083 8654083 "E" 3Y9)

5. Spacer plate (all other) 8647454 8647454 "C"

6. Spacer plate (9TN, 9TP, 9M6, 8654084 8654084 "H" 9M H, 3TS, 3TZ, 3T8, 3TP, 3MV, 3VJ, 3TL)

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.