Arb RD111 User Manual download pdf (Page 8)

2 Removing the Existing Differential

2.4 Checking the Current Backlash Amount

IMPORTANT:

This step is a precautionary measure recommended by ARB due

to the fact that some aftermarket ring and pinion sets have been

manufactured to run with different backlash settings than those

specified by your vehicle manufacturer. Although ARB must

recommend you set backlash according to your service manual

guidelines, we also advise that you compare the backlash

measurements taken here to the recommended backlash settings

in your vehicle service manual. Measurements found to be

outside of your service manual recommendations may indicate

the need to deviate from those settings in order to achieve quiet

running with a good contact mark.

Refer to your vehicle service manual or your local authorized

ARB installer for more information.

c Set a long series lever type dial indicator on one of the ring gear

teeth. Access to the ring gear teeth is gained through the oil filler

hole. (Refer to Figure 1.)

Figure 1.

c Insert a large flat screwdriver or pry-bar through one of the axle

stub holes so that it wedges between the cross shaft and the carrier

body so that the differential center can be rotated by the cross

shaft, and not by the spline of one of the differential gears.

c While supporting the pinion gear by holding the drive shaft flange,

rotate the differential in both directions (with the screwdriver or pry-

bar) while observing the maximum variation in depth from the

indicator (i.e., the highest value minus the lowest value). This value

is referred to as the ring and pinion backlash.

c Rotate the differential center 90° and measure again for accuracy.

c Record the average of all measurements.

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Arb RD111 User Manual Page 8