Arb RD84 Manuel d'utilisateur télécharger pdf (Page 16)

3 Installing the Air Locker

3.3 Approximate Backlash Shimming

In order to reproduce a similar pre-load and ring and pinion backlash

in your Air Locker to that of your original differential, measurements

need to be taken so that a shim thickness can be calculated.

c Secure the original differential to a work bench.

c Remove the bolts that hold the ring gear in place.

NOTE : GM 8.5” ring gear bolts are usually left-hand threaded.

c Using a plastic or copper hammer, tap in a circle around the ring

gear to separate it from the differential carrier.

Figure 9.

c Assemble the original bearing cup onto the cone of the right-hand

side of the original differential carrier.

c Using a caliper or similarly accurate measurement method

(i.e., able to take accurate measurements within 0.04mm [0.0015”]),

measure the distance from the shoulder of the outer face of the

bearing cup to the ring gear mounting face (shown as ‘A’ in Figure

9.) and record this measurement as ‘A’.

NOTE : Be sure to measure using the bearing cup that

originally came off of the right-hand side.

c Measure the thickness of the original master shim that was

removed from the right-hand side of the original differential carrier

(shown as ‘B’ in Figure 9.) and record this measurement as ‘B’.

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Arb RD84 Manuel d'utilisateur Page 16