NO OR HARSH 1-2 SHIFT AT W.O.T REPAIRS OUTLINED
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.
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.
