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 shaft with ST1 and ST2. Then pull off the drive pinion collar.
ST1 498937110 HOLDER

ST2 499787700 WRENCH

ST3 499787500 ADAPTER

Fig 1: Removing Drive Pinion Collar
Courtesy of SUBARU OF AMERICA, INC.
Remove the O-ring.
Using a press, separate the rear roller bearing and outer race from the shaft.

Fig 2: Separating Rear Roller Bearing & Outer Race From Shaft
Courtesy of SUBARU OF AMERICA, INC.
Using a press and ST, separate the front roller bearing from the shaft.
ST 498517000 REPLACER

Fig 3: Separating Front Roller Bearing From Shaft
Courtesy of SUBARU OF AMERICA, INC.