VTD Model

1. ST 398643600 Gauge
2. L = Measured value - 15 mm
3. (L = Measured value - 0.59 in)

Fig 2: Measuring Distance "L" Between Mating Surface Of Extension Case

Courtesy of SUBARU OF AMERICA, INC.

1. A:  Measured value
2. B:  Thickness of special tool [15 mm (0.59 in)]
3. L:  Distance between extension case edge and rear driveshaft edge

1. l  = Measured value - 15 mm
2. (l  = Measured value - 0.59 in)
3. ST 398643600 Gauge

Fig 3: Measuring Distance Between Mating Surface Of Transmission Case & Reduction Drive Gear Edge

Courtesy of SUBARU OF AMERICA, INC.

1. A:  Measured value
2. B:  Thickness of special tool [15 mm (0.59 in)]
3. l:  Distance between extension case edge and reduction drive gear edge

When clearances are 0.05 mm (0.0020 in) and 0.25 mm (0.0098 in), select up to four adjusting shims from the table, suitable for clearance value.

1. H = (L + 0.45 mm) - l  - T
2. [H = (L + 0.0177 in) - l  - T]
3. T:  Shim clearance
4. L:  Distance between extension case edge and rear driveshaft edge
5. 0.45 mm (0.0177 in):  Gasket thickness
6. l:  Distance between transmission case edge and reduction drive gear edge
7. T:  Shim thickness
8. 0.05-0.25 mm (0.0020-0.0098 in)

Example: 

1. When, L = 90.50 mm (3.5630 in), l  = 90.35 mm (3.5571 in)
2. Calculation for 0.05 mm of clearance (0.0020 in)
   1. H = (90.50 + 0.45) - 90.35 - 0.05 = 0.55
   2. [H = (3.5630 + 0.0177) - 3.5571 - 0.0020 = 0.0217]
3. Calculation when clearance is 0.25 mm (0.0098 in)
   1. H = (90.50 + 0.45) - 90.35 - 0.25 = 0.35
   2. [H = (3.5630 + 0.0177) - 3.5571 - 0.0098 = 0.0138]

After calculation, the value of "H" becomes between 0.35 mm (0.0138 in) and 0.55 mm (0.0216 in), therefore select two shims with thickness of 0.2 mm (0.010 in) or one shim with thickness of 0.5 mm (0.020 in).