GM Service Manual Online
For 1990-2009 cars only

INTERMITTENT 2ND GEAR STARTS CB AND HY MODEL THM 125-C

1983 THM 125-C MODEL "CB" AND "HY" TRANSMISSION, MAY EXPERIENCE A CONDITION WHERE THE TRANSMISSION WILL START OUT IN SECOND GEAR. BEGINNING WITH TRANSMISSION SERIAL NUMBERS 83-CB-29352 AND 83-HY-3199, ALL "CB" AND "HY" MODEL THM 125-C TRANSMISSION ARE NOW BEING PRODUCED WITH A GOVERNOR ASSEMBLY THAT HAS THE PRIMARY SPRING REMOVED. WHEN SERVICING ANY 1983 THM 125-C "CB" OR "HY" MODEL TRANSMISSION BUILT PRIOR TO THE ABOVE SERIAL NUMBERS, WITH A SECOND GEAR START CONDITION, REFER TO THE FOLLOWING SERVICE PROCEDURE: SERVICE PROCEDURE-- REFER TO THE SERVICE MANUAL FOR PROPER REMOVAL AND INSTALLATION PROCEDURES: 1. REMOVE THE GOVENOR ASSEMBLY FROM THE TRANSMISSION. 2. REMOVE THE PRIMARY SPRING FROM THE GOVENOR ASSEMBLY (FIGURE 1) 3. REINSTALL THE GOVENOR ASSEMBLY.


Object Number: 86633  Size: LF

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.