VTD Model

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

Fig 1: Inserting Rear Drive Shaft Into Reduction Drive Gear
Courtesy of SUBARU OF AMERICA, INC.
Using the ST, measure the distance "L" from the end of the ST to the rear drive shaft ball bearing outer ring contact surface.
ST 398643600 GAUGE

Fig 2: Measuring Distance "L" From End Of ST To Rear Drive Shaft Ball Bearing Outer Ring Contact Surface
Courtesy of SUBARU OF AMERICA, INC.
Measure the distance "B" from the transmission case mating surface to the end surface of the ST using the ST.
ST 398643600 GAUGE

Fig 3: Measuring Distance "B" From Transmission Case Mating Surface To End Surface Of ST
Courtesy of SUBARU OF AMERICA, INC.
Calculation formula:
Calculate "T":

When the clearance is 0.05 mm (0.0020 in), select up to four adjusting shims from the table, according to the clearance value.

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 extension case to the rear drive shaft ball bearing outer ring contact surface

B: Distance from the end of the transmission case to the end of the ST T: Shim thickness

0.05 - 0.25 mm (0.0020 - 0.0098 in)

ADJUSTMENT SHIM THICKNESS