Arb RD99 User Manual download pdf (Page 13)

3 Installing the Air Locker

3.2

Re-Mounting the Ring Gear

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

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

gear to separate it from the original differential carrier.

NOTE : Some aftermarket ring gears use 1/2” diameter bolt

threads instead of 7/16”. If this is the case then the

bolt holes of the Air Locker will require enlargement

to 13mm [0.512”]. This operation should be

performed by a qualified machinist.

 Apply a thin film of high pressure grease to the ring gear shoulder

of the Air Locker to prevent seizing.

 Thoroughly clean any thread locking compound or other foreign

matter from the holes of the ring gear, the threads of the ring gear

bolts, and the mating surfaces between the ring gear and the Air

Locker flange.

HINT : Stoning the ring gear mounting face before

installation will remove any high spots around the

threads.

 Heat the ring gear to between 80 and 100°C [175 - 212°F] in hot

water or in an oven to slightly expand the gear and facilitate

assembly.

NOTE : NEVER HEAT GEARS WITH A FLAME! This could

damage the hardened surface of the gear and result

in premature wear or failure.

 Dry the gear and bolt holes with compressed air (if wet).

 Install the ring gear onto the Air Locker by aligning the bolt holes

and then gently tapping it around in a circle with a soft mallet.

Avoid using the bolts to pull down the ring gear as this puts excess

strain on the bolts and the differential flange.

 Apply a thread locking compound to the thread of each ring gear

bolt before inserting it. Do not apply the compound directly into the

threaded hole as this could prevent the bolt from reaching its full

depth.

 Tighten the ring gear bolts in a star pattern with a torque wrench

according to your vehicle manufacturer’s specified torque

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Arb RD99 User Manual Page 13