Input Shaft Disassemble

Tools Required

• 87-90-636  Pinion Fixture. See Special Tools and Equipment .
• 87-91-121  Input Shaft Puller Ring. See Special Tools and Equipment .
• 87-91-287  Puller. See Special Tools and Equipment .
• 87-91-642  Basic Puller. See Special Tools and Equipment .
• 87-92-152  Input Shaft Puller. See Special Tools and Equipment .

1. Mount the input shaft in a vise with soft jaws.
2. Remove the bearing retaining ring and discard.
Fig 1: Removing Bearing Retaining Ring
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The input shaft bearing can not be reused after removal. It must be replaced.
IMPORTANT: Loosen the 87-92-152  until the tool sits flush on the 4th drive gear before tightening the tool onto the bearing. See Special Tools and Equipment .
3. Remove the input shaft bearing using the 87-92-152  and the 87-91-642  . See Special Tools and Equipment .
Fig 2: Removing Input Shaft Bearing
Courtesy of GENERAL MOTORS CORP.
4. Remove the 4th drive gear, 4th gear blocking ring, and 4th gear bearing.
Fig 3: View Of 4th Drive Gear, 4th Gear Blocking Ring & 4th Gear Bearing
Courtesy of GENERAL MOTORS CORP.
CAUTION: The synchronizer detent inserts may be forced out by spring pressure and could injure someone. To help avoid injury, always cover the synchronizer hub detent openings during disassembly.
5. Move the 3rd/4th gear synchronizer sleeve down, toward third gear, far enough to remove the synchronizer detent inserts with a small screwdriver.
Fig 4: View Of Synchronizer Hub Detent
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Note the orientation of the 3rd/4th gear synchronizer sleeve. It needs to be installed in the same orientation.
6. Remove the 3rd/4th gear synchronizer sleeve.
Fig 5: View Of 3rd/4th Gear Synchronizer Sleeve
Courtesy of GENERAL MOTORS CORP.
7. Remove the 3rd/4th gear synchronizer insert pins and springs.
Fig 6: View Of 3rd/4th Synchronizer Insert Pins & Springs
Courtesy of GENERAL MOTORS CORP.
8. Remove the 3rd/4th gear synchronizer hub retaining ring and washer. Remove the 3rd/4th synchronizer hub using the 87-91-287  under the 3rd gear. See Special Tools and Equipment .
Fig 7: Removing 3rd/4th Gear Synchronizer Hub
Courtesy of GENERAL MOTORS CORP.
9. Remove the 3rd gear blocking ring, 3rd drive gear, and 3rd gear bearing assembly.
Fig 8: View Of 3rd Gear Blocking Ring, 3rd Drive Gear & 3rd Gear Bearing Assembly
Courtesy of GENERAL MOTORS CORP.
10. Press off the input shaft bearing, next to 1st drive gear, using the 87-91-121  and the 87-90-636  . See Special Tools and Equipment .
Fig 9: Pressing Off Input Shaft Bearing
Courtesy of GENERAL MOTORS CORP.