ARB RD40 - Manual (Page 20)

3 Installing the Air Locker
18
IMPORTANT:
It 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 center, increased running
noise, and ultimately, ring and pinion gear damage.
Adjust the backlash and pre-load using an adjuster nut wrench to
tighten or loosen the adjuster nuts as required. (Refer to your
vehicle service manual.)
Recheck backlash as before, repeating this procedure until
backlash is within the specified amount.
Tighten all bearing cap bolts with a torque wrench to the torque
specified in your vehicle manufacturer’s service manual.
Figure 12.