NO OR HARSH 1-2 SHIFT AT W.O.T REPAIRS OUTLINED
1986 STE WITH THM 125C TRANSAXLES CODE 6CUC
I. Harsh 1-2 Shift
Date Of Production Change: (Figure 1) May 15, 1986 (Julian date 135) new intermediate servo parts.
Service Action:
To service a 1986 (built before Julian date 135) THM 125C model CUC transaxle, install a new intermediate servo piston, seals, cover and gasket.
Service Parts Information:
8652900 - Package--Intermediate servo piston, inner and outer seals 8631703 - Intermediate servo cover 8631698 - Intermediate servo cover gasket
Service Manual Reference:
Refer to the THM 125C (MD9) Automatic Transaxle Unit Repair Table Of Contents for intermediate servo service information.
Service Notes:
The new intermediate servo piston has a smaller apply surface area to provide a smoother 1-2 shift.
II. No 1-2 Shift At Wide Open Throttle
Date Of Production Change: (Figure 1) July 15, 1986 (Julian date 196) new control valve assembly and gaskets.
Service Action:
To service a 1986 (built between Julian dates 170 and 195) THM 125C model CUC transaxle, install a new control valve assembly and gaskets.
Service Parts Information:
8652311 - Control valve assembly 8652506 - Package--case to spacer plate and spacer plate to control valve assembly gaskets
Service Manual Reference:
Refer to the THM 125C (MD9) Automatic Transaxle Unit Repair Table Of Contents for control valve assembly service information.
SERVICE DEPARTMENT PONTIAC DIVISION GENERAL MOTORS CORPORATION
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.
