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[Web Creator] [LMSOFT]
VC Commodore Differential Issues
Phoenix Mechanical
Soaring

Pinion Backlash - Two main items of any differential are the crown wheel and pinion. These items are matched together and are preset to specific tolerances, and one of these tolerances is backlash (movement between gears). Due to age and stresses on the gears, the amount of tolerance between the teeth of the crown wheel and the pinion will increase. This can be evident by increased tail shaft rotation before axle movement. As backlash increases the likely hood of differential failure also increases.

Tail shaft centre mount - Commodores use a 2 piece tail shaft and the centre is supported by a centre mount bearing which is bolted to the floor. The centre mount bearing is caged in rubber which helps absorb torsional twist and vibrations, but the rubber can split which allows the centre of the tail shaft to rotate unsupported. Tail shaft centre mount bearings are readily available, but the tail shaft needs to be separated for installation, and correct reassembly is important and best left to qualified repairers. The tail shaft centre mount bracket is also responsible for tail shaft drive angle. When a vehicle is lowered, repositioning of the centre mount bracket spacers is required to correct the drive angle, and reduce vibrations during take off.