Subaru 2009 IMPREZA Service Manual page 1930

AUTOMATIC TRANSMISSION
4) Using the ST1, ST2 and ST3, remove the snap
ring, then take out the return spring and transfer
clutch piston seal.
ST1 399893600 PLIER
ST2 398673600 COMPRESSOR
ST3 398623600 SEAT
ST1 ST1
(A) (A)
(B) (B)
(A) Snap ring
(B) Transfer clutch piston seal
5) Apply compressed air to the rear drive shaft, to
remove the transfer clutch piston.
Transfer Clutch
D: ASSEMBLY
1) Install the transfer clutch piston.
ST2 ST2
ST3 ST3
AT-00130
2) Install the return spring to transfer clutch piston.
3) Apply ATF to the lip of transfer clutch piston seal,
AT-00131
then install.
4AT-74
(A)
(A) Transfer clutch piston
(B) Rear drive shaft
(A)
(B)
(A) Return spring
(B) Rear drive shaft
(A)
(A) Transfer clutch piston seal
(B) Rear drive shaft
(B)
AT-00132
AT-00133
(B)
AT-00134