ENGINE FLARE/DELAYED PART THROTTLE 3-2 DOWNSHIFT THM 325

A CALIBRATION CHANGE HAS BEEN MADE IN PRODUCTION FOR THE 1981 "AG" AND "BE" MODEL THM 325 TRANSMISSIONS. THIS CALIBRATION CHANGE WILL GIVE AN IMPROVED DOWNSHIFT FEEL FOR PART THROTTLE 3-2 DOWNSHIFTS. IF CUSTOMER COMMENTS INDICATE AN ENGINE FLAIR (ENGINE R.P.M. INCREASE) AND/OR A DELAYED PART THROTTLE 3-2 DOWNSHIFT. THIS CONDITION MAY BE CORRECTED BY USING PARTS CONTAINED IN SERVICE PACKAGE 8632990. THE NEW SERVICE PACKAGE, PART NUMBER 8632990, WILL CONTAIN THE FOLLOWING PARTS: DIRECT CLUTCH EXHAUST SPRING INTERMEDIATE SERVO PISTON AND SEALS INSTRUCTION SHEET PLEASE AMEND HYDRA-MATIC SERVICE BULLETIN NO. HM 81-30 AS FOLLOWS: 1.THE SERVO PISTON IN THE ORIGINAL SERVICE PACKAGE (8632990) DOES NOT CONTAIN AN ORIFICE CUP PLUG. USE OF THE ORIGINAL PACKAGE MAY CAUSE LACK OF THIRD GEAR APPLY. 2.DELETE SERVICE PACKAGE NO. 8632990 AND USE NO. 8632994 IN ITS PLACE. 3.THE NEW SERVICE PACKAGE NO. 8632994 WILL CONTAIN THE FOLLOWING PARTS: DIRECT CLUTCH EXHAUST SPRING INTERMEDIATE SERVO PISTON AND SEALS INSTRUCTION SHEET

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.