VTD Model

Insert the rear drive shaft into the reduction drive gear and center differential assembly.

Fig 1: Identifying Rear Drive Shaft And Reduction Drive Gear And Center Differential Assembly
Courtesy of SUBARU OF AMERICA, INC.
Using the ST, measure distance "A", from the mating surface of the extension case to the rear drive shaft ball bearing outer ring contact surface.
ST 398643600 GAUGE

Fig 2: Identifying Rear Drive Shaft And Center Differential Assembly
Courtesy of SUBARU OF AMERICA, INC.
Using the ST, measure distance "B", from the mating surface of the transmission case to the end face of the rear drive shaft ball bearing.
ST 398643600 GAUGE

Fig 3: Measuring Distance Of Mating Surface And Transmission Case
Courtesy of SUBARU OF AMERICA, INC.

Calculation formula:

When the clearance is 0.05 mm (0.0020 in), select up to 4 adjustment shims that will meet the clearance value on the table.

Calculation of "T":

When clearance is 0.05 mm (0.0020 in)

T = A - B + 0.40 mm

[T = A - B + 0.0157 in]

When clearance is 0.25 mm (0.0098 in)

T = A - B + 0.20 mm

[T = A - B + 0.0079 in]

T: Shim clearance

A: Distance from the end of the extension case to the end of rear drive shaft

B: Distance from the end of the transmission case to the end of the reduction drive gear

T: Shim thickness

0.05 - 0.25 mm (0.0020 - 0.0098 in)

THICKNESS CHART