Drive Pinion Shaft Assembly: Disassembly

Flatten the lock nut tab, and then remove the lock nut while holding the rear spline part of the shaft using ST1 and ST2. Pull out the drive pinion collar.
ST1 18667AA010 HOLDER

ST2 499787700 WRENCH

ST3 499787500 ADAPTER

Fig 1: Pulling Drive Pinion Collar Using Holder, Wrench And Adapter
Courtesy of SUBARU OF AMERICA, INC.
Remove the O-ring.
Separate the roller bearing and outer race from shaft using a press.

Fig 2: Removing Roller Bearing And Outer Race From Shaft Using Press
Courtesy of SUBARU OF AMERICA, INC.
Separate the front roller bearing from the shaft using a press and the ST.
ST 498517000 REPLACER

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