Input Clutch

Check the clearance of the input clutch. Measure the clearance "L" between snap ring and retaining plate using a thickness gauge. If it is out of specification, replace the entire input clutch assembly.
Check for damage on the drive plate, driven plate and snap ring, and replace the entire input clutch assembly if damaged.
Standard:

0.7 - 1.1 mm (0.028 - 0.043 in)

Fig 1: Identifying Input Clutch Clearance
Courtesy of SUBARU OF AMERICA, INC.