HARSH 2-1 DOWNSHIFT DELAYED DOWNSHIFT INFORMATION. GMC Truck S15 Pickup - 4WD 1983

For 1990-2009 cars

# HARSH 2-1 DOWNSHIFT DELAYED DOWNSHIFT INFORMATION

#### MODELS: 1982-1983 LIGHT DUTY WITH THM 700-R4 TRANSMISSION

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 No. 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 (9M2,9M4,9M5,9M7, 8647455 8647455 D 9MB, 9MC, 9MD, 9ME, 3Y2, 3VA, 3YK)

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

5. Spacer Plate (All Others) 8647454 8647454 C

6. Spacer Plate (9TN, 9TP, 9M6, 9MH, 8654084 8654084 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.