ARB RD158 - Manual (Page 13)

3 Bench Measurement
11
3.2 Calculation & Selection of Shims
Ideally, the measurement you recorded as ‘A’ from the OE differential
will closely match ‘C’ on the Air Locker differential (within 0.1mm
[0.004”]). However, quite often these measurements will vary slightly
between one factory differential and the next.
If this is the case you must create a new shim pack thickness by using
the measurements you recorded earlier to find a desired measurement
for ‘D’ in Fig. 6.
Use the following calculation:
A + B – C = D
HINT : If your calculations are correct then the following
equation will also be true:
A + B – C – D = ZERO
To make a shim pack to match the measurement you calculated as ‘D’
you can:
 Select shims from the shim kit supplied with your Air Locker kit
 Purchase a new shim kit from your vehicle dealer.
 Use a universal shim kit available from most drive train
specialists.
NOTE : Never re-use any shims which are damaged or worn.