Tools Required

87 91 311  Bearing Driver Shaft Sleeve. See Special Tools .

Fig 1: Tapping Reverse Idler Gear Shaft Out Of Shaft Support Bracket
Courtesy of GENERAL MOTORS CORP.
1. Put the reverse idler gear shaft in the 87 91 311  . See Special Tools . Ensure that the rim of the 87 91 311  rests on the reverse gear and not on the idler shaft washer. See Special Tools .
IMPORTANT: When tapping out the reverse idler rear shaft, make sure the shaft washer does not separate from the shaft.
2. Carefully tap the reverse idler gear shaft out of the shaft support bracket using a punch in the center of the shaft.
Fig 2: Identifying Shaft Support Bracket
Courtesy of GENERAL MOTORS CORP.
3. Remove the shaft support bracket.
4. Remove the reverse idler gear washer, reverse gear, reverse synchronizer sleeve, reverse gear blocking ring with leaf springs, spring ring, reverse idler gear, and reverse gear bearing.
5. Inspect the condition of the gears and synchronizer. Refer to Synchronizers Cleaning and Inspection .
6. Measure the clearance between the blocking ring and reverse the idler gear in 4 places.

   Specification:  The minimum blocking ring clearance for the reverse gear synchronizer is 0.5 mm (0.02 in).