Drive Pinion Shaft: Disassembly

Straighten the staked portion of the lock nut, and remove the lock nut while locking the rear spline portion of the drive pinion shaft with ST1 and ST2. Then pull off the drive pinion collar.
1. ST1 498937110 HOLDER
2. ST2 499787700 WRENCH
3. ST3 499787500 ADAPTER
Fig 1: Identifying Lock Nut
Courtesy of SUBARU OF AMERICA, INC.
Remove the O-ring.
Using a press, separate the rear roller bearing and outer race from the drive pinion shaft.

Fig 2: Separating Rear Roller Bearing And Outer Race From Drive Pinion Shaft]
Courtesy of SUBARU OF AMERICA, INC.
Using a press and ST, separate the front roller bearing from the drive pinion shaft.
1. ST 498517000 REPLACER
Fig 3: Separating Front Roller Bearing From Drive Pinion Shaft
Courtesy of SUBARU OF AMERICA, INC.