Transmission Disassembly
- Mount transmission in holding fixture. Remove transmission cover assembly-to-case bolts. If required, insert 2 bolts in cover flange threaded holes and turn bolts evenly to raise cover dowel pins from case.
- Move reverse shift fork so reverse idler gear is partially engaged before removing cover assembly. Remove cover assembly. Place transmission in 2 gears at once to lock gears.
- Remove yoke and parking brake drum assembly (if equipped). On 4WD models, use Main Bearing Lock Nut Socket (J-35907) to remove mainshaft rear bearing lock nut. See Fig 1.
- On all models, remove rear bearing retainer and gasket. Slide speedometer drive gear off mainshaft. Remove drive gear bearing retainer and gasket from case. Remove countergear front bearing cap and gasket. Pry countergear front bearing out by inserting 2-Pronged Puller (J-28509) through cast slots in case.
- Remove countergear rear bearing retaining ring from countergear shaft and bearing. Using Puller (J-8433-1) with Bearing Puller (J-22832), remove countergear rear bearing. See Fig 2. Let countergear assembly rest on bottom of case.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.
- Remove drive gear bearing-to-case snap ring. Rotate drive gear to place cut-out portion in down position in order to clear countergear. Remove drive gear from case. Remove 4th gear synchronizer ring. Remove mainshaft rear bearing retainer ring. Using Puller (J-8433-1) with Bearing Puller (J-22832), remove rear mainshaft bearing from case.
- Slide 1st gear thrust washer off mainshaft. Raise rear of mainshaft assembly and push rearward in case bore. Remove mainshaft from case. Remove synchronizer cone from shaft.
- Slide reverse idler gear rearward, and move countershaft rearward until front end is free of case. Remove countershaft from case. Using a driver, drive reverse idler gear shaft out of case's rear. Remove reverse idler gear and bushing from case.
Courtesy of GENERAL MOTORS CORP.