Arb RD111 User Manual download pdf (Page 12)

3 Installing the Air Locker

3.2 Calculation & Selection of Backlash Shims

Ideally, the measurement you recorded as ‘C’ from the Air Locker

differential will closely match ‘A’ on the existing differential (within

0.1mm [0.004”] ) and then the factory shim can be reused, 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 Figure 3.

Use the following calculation:

A + B – C = D (Replacement Shim Pack)

HINT : If your calculations are correct then the following

calculation will also be true:

A + B – C – D = ZERO

c Create a shim pack to match the thickness calculated as ‘D’.

To achieve the desired shim thickness you can:

• Machine down the factory shim thickness.

• Add shims between the factory shim and the bearing cup.

HINT : A selection of shims of this size have been supplied

with your Air Locker kit.

• Purchase new factory shims at the desired thickness.

• Use a universal shim kit available from most drive train

specialists.

• Add small amounts of shim between the bearing cone and the

bearing seat.

NOTE : NEVER machine the Air Locker.

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Arb RD111 User Manual Page 12