TRANSMISSION UPDATES SUMMARY 125 TRANSMISSION

Subject: THM 125-125C TRANSMISSION PARTS AND PROCEDURE INFORMATION UPDATE

When making internal repairs on any 1980-1982 THM 125-125C transmission, the following latest design parts should be used where applicable.

PART MODEL BULLETIN NUMBER YEAR PART REFERENCE SECTION ------- --------- ----------------------- --------- -------- 8631987 1980-1981 Solid turbine shaft oil 80-1-69 7 8631968 1982 seal rings

8637640 All Band anchor plug 81-1-181 7 (if dislodged)

8643964 All Third accumulator check 82-T-83 7 valve and spring

8637836 1980-1981 Oil weir 81-1-190 7

112496 All Pressure regulator valve 82-T-22 7 solid pin

To help you provide this service, WDDGM will package the parts indicated as a single item under the following part numbers:

1980-1981 Models - 8643995 1982 Models - 8643996

In addition to the above items, the following should be checked.

Check and drill vent hole in case cover if not present. 80-T-85 7

Check wear in differential carrier bore to determine 81-1-198C 7 need for right drive axle external bearing repair package. Package part number is 8643931. The axle shaft sleeve seal originally available only in this kit is now available as a separate part under part number 8643962.

If inspection of the transmission at the time of disassembly reveals any form of internal damage, the transmission cooler lines should be cleaned and flushed using the procedure provided in Section 7A of the 1982 Phoenix And 6000 Service Manual, page 7A-2.

Also, only Loctite #515 (part number 1052756) should be used at the case cover to case gasket to prevent leaks in this area.

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.