MPT Model

WARNING: This page is about a different car, the 2004 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Measure distance "A" from end of extension case and rear drive shaft with ST.
ST 398643600 GAUGE

Fig 1: Measuring Distance "A" From End Of Extension Case And Rear Drive Shaft With ST
Courtesy of SUBARU OF AMERICA, INC.
Measure the distance "B" from the transmission case mating surface to the reduction drive gear end surface with ST1 and ST2.
ST1 398643600 GAUGE

ST2 499577000 GAUGE

Fig 2: Measuring Distance "B" From Transmission Case Mating Surface To Reduction Drive Gear End Surface
Courtesy of SUBARU OF AMERICA, INC.
Calculation formula:

NOTE:

Calculate "T":
T = A - B + 35.4 mm

[T = A - B + 1.3937 in]

T: Thrust needle bearing thickness

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

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

Example:

When, A = 33.6 mm (1.3228 in), B = 65.05 mm (2.5610 in)

T = 33.6 - 65.05 + 35.4 = 3.95

[T = 1.3228 - 2.5610 + 1.3937 = 0.1555]

After calculation, the value of "H" becomes 3.95, therefore select bearing thickness of 3.8.
Calculation formula for "T" is applied when measuring using ST (398643600 GAUGE, 499577000 GAUGE). When not using ST, apply
T = (A - alpha + 0.45 mm) - (B - alpha) - H

[T = (A - alpha + 0.0177 in) - (B - beta) - H].

T: Thrust needle bearing thickness

A: Distance from end of extension case to end of reduction drive shaft

B: Distance from end of transmission case to end of rear drive shaft

alpha: Collar thickness used when measuring "A"

beta: Collar thickness used when measuring "B"

0.45: Gasket thickness (mm)

H: Shim clearance

Fig 3: Thrust Needle Bearing Table
Courtesy of SUBARU OF AMERICA, INC.