ARB RD166 - Manual (Page 21)

3 Installing the Air Locker
19
NOTE : Do not add shims between the bearing cone and the
bearing seat of the seal housing side and NEVER
machine the Air Locker.
F Remove the Air Locker from the axle housing.
F Install the shim pack µ'¶ between the bearing cup and the seal
housing as shown in Figure 9.
F Spread the differential housing again (Refer to Section 2.6).
F Re-­install the Air Locker into the axle housing.
NOTE : If the Air Locker is too tight to fully install then the
spreader tension may need to be increased. Do not
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NOTE : Use the ARB Shim Driver #0770004 to install the
supplied Air Locker shims.
F Rotate the seal housing until the tube is pointing straight out of the
axle housing.
F Release all spreader tension.
F Check that some backlash can be felt between the ring and pinion
gears. No backlash would be an early indication of incorrect shim
thickness.