THM 125/125C TRANS.REVISIONS P/N CHANGES AND TRANS. IDENT.

MODELS AFFECTED: 1984 CIMARRONS WITH THM 125C AUTOMATIC TRANSAXLE

Starting in May, 1984 with transaxle numbers 84 CA 2921 and 84 CB 240974 (refer to Figure 3), a new oil pump drive shaft and spacer assembly, pump shaft bearing and seal assembly, and control valve and pump assembly went into production on 1984 Cimarrons equipped with THM 125C automatic transaxles.

The new parts provide easier and improved assembly procedures. The former parts (Figure 1) are not interchangeable with the new parts (Figure 2) listed above for the following reasons:

1. The new oil pump drive shaft and spacer assembly has a thinner spacer and a longer bearing journal diameter to accommodate the new pump shaft bearing and seal assembly (Figure 2).

2. The new pump shaft bearing and seal assembly was also made longer in length to accommodate the seal as part of the bearing assembly (Figure 2).

3. The new control valve and pump assemblies were changed to accommodate the new oil pump drive shaft and roller pump shaft bearing and seal assemblies.

If the transaxle being serviced has a serial number lower than those listed in the first paragraph, refer to the 1984 parts list book. If the serial number is the same or larger, it will have the following new parts:

PART NAME PART NUMBER --------- ----------- Oil Pump Drive Shaft and Spacer Assembly 8643764 Pump Shaft Bearing and Seal Assembly 8643762 Control Valve Body Assembly 8652255

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.