Transfer Clutch: Adjustment

Install the drive plate and driven plate to the center differential carrier.
Using the ST, measure depth "A" from the end surface of ST to the transfer clutch piston.
ST 499575400 GAUGE

Fig 1: Measuring Transfer Clutch Piston Depth Using Gauge (ST 499575400)
Courtesy of SUBARU OF AMERICA, INC.
Using the ST, measure the height "B" from the mating surface of intermediate case to the end surface of ST.
ST 398744300 PISTON GUIDE

Fig 2: Measuring Intermediate Case Mating Surface Height Using Gauge (ST 499575400)
Courtesy of SUBARU OF AMERICA, INC.

Obtain the thickness of driven plate No. 3 using the following formula to select one driven plate No. 3.

T mm = (A - 15) - (B - 50) + 0.38 - (0.05 - 0.25)

[T in = (A - 0.591) - (B - 1.97) + 0.0149 - (0.002 - 0.01)]

T: Rear drive shaft shim thickness

A: Depth from the ST end surface to the transfer clutch piston

B: Height from the mating surface of the intermediate case to the ST end face

0.38 mm (0.0149 in): Thickness of gasket

15 mm (0.591 in): Thickness of ST

50 mm (1.97 in): Thickness of ST

0.05 - 0.25 mm (0.002 - 0.01 in): Clearance