ARB RD136 - Manual (Page 10)

2 Removing the Existing Differential
8
2.6 Removing the differential carrier
Remove the adjuster nut locking tabs.
Remove the bearing caps from the third member.
Remove the adjuster nuts.
Carefully remove the differential carrier from the third member.
2.7 Use of the Thrust Block
As this Air Locker has been designed to cover a range of Nissan
applications, some installations may require a floating thrust block
(supplied) to be inserted into the diff center. If you are unsure whether
this applies to you, look down the splines of the OE diff you have
removed from the vehicle to see if a thrust block used to maintain axle
end float is present.
Remove the flange cap and splined side gear from the Air Locker.
Insert the thrust block into the center of the diff.
Replace the splined side gear and flange cap.
HINT : A wad of thick grease will help to hold the thrust block
in place during installation.