Mercedes-Benz W126 limited-slip differential (ASD) and its faults
300 SEL280 SE
What oil goes in the W126 limited-slip differential (ASD)?
A friction-type limited-slip differential needs oil made for limited-slip differentials. Ordinary rear axle oil wears out the friction plates of the lock. ASD stands for automatic locking differential, while ASR is traction control.
What parts does an ASD differential repair need?
Repair parts include bearings, the lock's friction surfaces, repair kits for the ASD rams and seals. First find out the condition of the axle by checking the play while moving the driveshaft.
My W126 clunks when changing gear, could the differential be the cause?
Yes. A sharp metallic clunk can be caused by the planet gear shaft of the differential turning in its housing. Other causes are the rear subframe bushings and the driveshaft's flex discs. A worn cross pin should not be welded fixed, because it breaks right away.
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