Main Shaft Assembly: Disassembly

NOTE: When replacing the coupling sleeve and synchronizer hub, replace them as a set. Because these must engage at the specified point, avoid disassembly as much as possible. If it is necessary to disassemble, mark the engaging points on the splines beforehand.

Put vinyl tape around the main shaft spline and pull out the oil seal and needle bearing by hand to prevent the oil seal from being damaged.
Flatten the tab of the lock nut.
Remove the lock nut and lock washer using ST1 and ST2.
ST1 498937000 TRANSMISSION HOLDER

ST2 499987003 SOCKET WRENCH (35)

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Remove the 6th drive gear and ball bearing using the ST1, ST2 and a press.
ST1 899864100 REMOVER

ST2 18722AA010 REMOVER

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Remove the 6th needle bearing, 6th baulk ring, 5th-6th shifting insert and 5th-6th coupling sleeve.
CAUTION: When removing the 5th-6th coupling sleeve, be careful not to lose the 5th-6th shifting insert.
Remove the 5th drive gear, 6th needle bearing race, 5th baulk ring, 5th-6th synchronizer hub and 5th needle bearing using the ST1, ST2 and a press.
ST1 899864100 REMOVER

ST2 18722AA010 REMOVER

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Shift the 3rd-4th coupling sleeve to the 3rd side.
Remove the 4th drive gear, 4th gear thrust washer, double taper roller bearing and 5th needle bearing race using the ST1, ST2 and a press.
ST1 899864100 REMOVER

ST2 899714110 REMOVER

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Remove the 4th baulk ring, 4th needle bearing, 3rd-4th shifting insert and 3rd-4th coupling sleeve.
CAUTION: When removing the 3rd-4th coupling sleeve, be careful not to lose the 3rd-4th shifting insert.
Remove the 3rd drive gear, 4th needle bearing race, 3rd-4th synchronizer hub, 3rd inner baulk ring, 3rd synchro cone, 3rd outer baulk ring and 3rd needle bearing using the ST1, ST2 and a press.
ST1 899864100 REMOVER

ST2 899714110 REMOVER

Courtesy of SUBARU OF AMERICA, INC.