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Mechanic Martyn
Mechanic Martyn, Mechanic
Category: Car
Satisfied Customers: 1002
Experience:  Advanced trade certificate in Automotive engineering
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tranny..gas pedal..Mechanic says noise on turning

Resolved Question:

1979 MB 450 making low.soft whirring noise seemingly from tranny when gas pedal is released. Mechanic says noise on turning though...
Submitted: 4 years ago.
Category: Car
Expert:  Mechanic Martyn replied 4 years ago.

Hello and welcome back to Just Answer.

You are right of course - a differential would make a noise cornering. The mechanic was using a bit of tradie slang. What he should have said was "final drive" to be more accurate.

What you have is some wear in the pinion bearings in the final drive. As the thrust changes from driving to overrun when the accelerator is released you get some noise. It's common after a while on all rear wheel drive cars.

It's going to mean a final drive rebuild and that's costly. You could add some aftermarket product like an oil stabilizer to ward that off for a while - some stp for final drives for instance - however sooner or later it will need a rebuild.


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