ARB RD147 - Manual (Page 16)

3 Installing the Air Locker
14
The thickness of the shim pack ‘B’ should make the distance ‘C’ on the
Air Locker closely match the distance ‘A’ on the existing differential
(within 0.1mm [0.004”] ).
Use the following calculation to find the desired thickness of ‘B’:
A – C = B (Replacement Shim Pac k)
HINT : If your calculations are correct then the following
equation will also be true:
A – B – C = ZERO
Select shims from the shim kit supplied with your Air Locker to
make the thickness ‘B’ as determined above.
Place this shim pack between the ARB master shim and the
bearing cup.
Re-measure the new distance ‘C’ from the Air Locker (now
including the shim pack ‘B’) to make sure that it matches ‘A’ on the
original differential.
NOTE : NEVER machine the Air Locker.