Main Shaft Assembly: Disassembly

Put vinyl tape around the main shaft splines to protect oil seal from damage. Then pull out the oil seal and needle bearing by hand.
Remove the lock nut from transmission main shaft assembly.
NOTE: Remove the caulking before removing lock nut.

ST1 498937000 TRANSMISSION HOLDER

ST2 499987003 SOCKET WRENCH (35)

Fig 1: Removing Caulking Before Removing Lock Nut
Courtesy of SUBARU OF AMERICA, INC.
Remove the 5th-Rev sleeve and hub assembly, baulk ring, 5th drive gear and needle bearing.

Fig 2: Removing 5th-Rev Sleeve & Hub Assembly
Courtesy of SUBARU OF AMERICA, INC.
Remove the snap ring and synchro cone stopper from 5th-Rev sleeve and hub assembly.

Fig 3: Removing Snap Ring & Synchro Cone Stopper From 5th-Rev Sleeve & Hub Assembly
Courtesy of SUBARU OF AMERICA, INC.
Using the ST1, ST2 and a press, remove the ball bearing, synchro cone and baulk ring (Rev).
NOTE:
- Replace the sleeve and hub with new ones. Do not attempt to disassemble because they must engage at a specified point. If they should be disassembled, mark engagement point on splines beforehand.
- Do not reuse the ball bearing.
ST1 499757002 INSTALLER

ST2 498077400 SYNCHRO CONE REMOVER

Fig 4: Removing Ball Bearing, Synchro Cone & Baulk Ring
Courtesy of SUBARU OF AMERICA, INC.
Using the ST1 and ST2, remove rest of the parts.
NOTE: Replace the sleeve and hub with new ones. Do not attempt to disassemble because they must engage at a specified point. If they should be disassembled, mark engagement point on splines beforehand.

ST1 899864100 REMOVER

ST2 899714110 REMOVER

Fig 5: Using ST1 & ST2, Removing Rest Of Parts
Courtesy of SUBARU OF AMERICA, INC.