ARB RD131 - Manual (Page 9)

2 Removing the Existing Differential
7
Set a depth indicator on one of the ring gear teeth as in Figure 2.
Figure 2.
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.
Rotate the differential center 90
° and measure again for accuracy.
Record the average of all measurements.
2.6 Removing the Differential Carrier
IMPORTANT:
Spreading the differential housing with a differential case
spreader is a step which is critical to set up bearing pre-load
when a differential is installed. Improper pre-load will result in
undue bearing wear, increased stresses in the differential carrier,
increased running noise, and ultimately, ring and pinion gear
damage.
Unbolt and remove the bearing caps.
Carefully spread the differential housing just enough to remove the
differential carrier (Refer to your vehicles service manual).
NOTE : Never spread the housing more than 0.5mm [0.020”]
Once the housing has been adequately spread, the differential may
be removed by pulling forward on the differential carrier.