Reaction Sun Gear and Drum Assemble

Fig 1: Locating Inspection Areas On Reaction Sun Gear and Drum

GM10619

Courtesy of GENERAL MOTORS CORP.

Inspect the reaction sun gear and drum assembly (678) for the following:
- Worn or scored bushings
- Damaged reaction sun gear teeth
- The band apply area of the drum for discoloration or wear
- The welds connecting the sun gear to the drum for voids or cracks
- A worn or damaged 1-2 support outer race

Fig 2: Identifying Reaction Sun Gear & Drum Assembly

GM893331

Courtesy of GENERAL MOTORS CORP.

Install the reaction sun gear and drum assembly (678) into the case.
Check that the lugs engage with the 1-2 support roller clutch inner race.