ARB RD129 - Manual (Page 11)

3 Bench Measurement
9
3.1 Approximate Backlash Shimming
In order to reproduce a similar pre-load and ring and pinion backlash
in your Air Locker to that of your original differential, measurements
need to be taken so that a shim thickness can be calculated.
c Secure the original differential to a work bench.
c Remove the bolts that hold the ring gear in place.
c Using a plastic or copper hammer, tap in a circle around the ring
gear to separate it from the differential carrier.
c Remove the original bearings and shims from the differential center
using a bearing puller.
NOTE : Keep the bearings and shims separated so that they
can be identified as to which end of the differential
they came from.
c Examine the bearing cups and cones from Fig. 4. for damage or
wear and, if necessary, discard them and replace with the same
size and type of bearings.
Figure 4.