ARB RD138 - Manual (Page 15)

3 Installing the Air Locker
13
Figure 7.
c Insert the original adjuster nut onto the opposite side of the
differential and tighten with the appropriate adjuster nut wrench.
NOTE : You should now feel some backlash between the ring
and pinion gears. If not, there might be a clearance
problem which is binding the carrier. Re-check the
clearance.
CLEARANCE REQUIRED