A/T - Bearing Noise in Park or Neutral
Model Year 1983Bulletin No. 83-118A
File in Group 70
Number 13A
Date May '83
SUBJECT: Bearing Noise in Park or Neutral
MODELS AFFECTED: 1982-83 THM 125C Transmission
Some 1982 and 1983 THM 125C transmissions may experience a noise condition, best described as a high pitched whine.
This noise condition, if only noticeable in Park and Neutral, and not in Drive or Reverse (while stopped with brakes applied), could be caused from one or more of the following bearings or by a rough surface on the driven sprocket where the driven sprocket roller cage bearing locates.
1. Drive Sprocket Roller Cage Bearing
2. Driven Sprocket Roller Cage Bearing
3. Driven Sprocket Thrust Bearing
4. Driven Sprocket
When servicing any 1982 or 1983 THM 125C for this bearing noise, first inspect the drive and driven sprocket roller cage bearings and driven sprocket thrust bearing for wear or damage. If wear or damage is visible on any of the above bearings or the bearing surface of the driven sprocket, replace them with service parts listed below:
1. Drive Sprocket Roller Cage Bearing - 8631186
2. Driven Sprocket Roller Cage Bearing - 8631190
3. Drive Sprocket Thrust Bearing - 9436851
Refer to your Service Manual for removal and installation procedures of the drive and driven sprocket support cage bearing.