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Problems with pinion bearings
Pinion Bearing Failures?
Porsche 968s have a transaxle gearbox, which means
that the gearbox final drive and differential are all located under
the boot between the rear wheels.
If you have a pinion bearing problem it will
be noticeable from about 35-40 mph when you will hear a whine. Test
on a straight road with a smooth surface for minimum tyre noise. Close
roof and windows, accelerate to 80-85 mph, lift off the accelerator,
if you hear noise resembling a jet plane slowing down on a runway -
you have a problem ! Alternatively you can secure the rear of the car
on stands, run the car in top gear and listen to the noise from the
gearbox. If you haven't got LSD you can stop one or the other wheels
to eliminate possible wheel bearing and CV joint noise.
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