ARB RD168 - Manual (Page 23)

3 Installing the Air Locker
21
3.8 Checking the Backlash
F Set a depth indicator on one of the ring gear teeth as in
Figure 11.
F While supporting the pinion gear by holding the drive shaft, rotate
the differential in both directions while observing the maximum
variation in depth from the indicator (i.e., the highest value minus
the lowest value). This value is referred to as the ring and pinion
backlash.
F Rotate the differential center 90 q and measure again for accuracy.
Figure 11.
F Refer to your vehicle service manual for the specified maximum
and minimum amounts of backlash. If the backlash is not within the
specifications then the differential will have to be removed and re-
shimmed.
3.8.1 Re-Shimming the Backlash
NOTE : This step is only necessary when adjusting for
incorrect backlash.
F Remove the bearing caps.
F Remove the differential as before.
F To decrease the amount of backlash, reduce the shim thickness ‘B’
(Fig.7.) and increase the shim thickness ‘D’ (Fig.9.) by the same
amount. Reverse this step to increase the backlash.