Subaru Legacy 2004 Service Manual page 2927

DRIVE SHAFT SYSTEM
Runout:
Service limit 0.6 mm (0.024 in)
(B)
(A) Propeller shaft
(B) Dial gauge
4. CENTER BEARING FREE PLAY
1) Remove the front and center exhaust pipe.
2) Remove the rear exhaust pipe and muffler.
3) Remove the heat shield cover.
4) Move the propeller shaft near center bearing up
and down, and left and right with your hand to
check for any abnormal bearing free play.
Propeller Shaft
(A)
DS-00036
DS-00037
DS-12