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RE: final drive lube
>..... diff is getting noisy and I don't know if the "mysterious
>evaporating lubricant" has ever been replaced as recommended by
>factory so long ago.
>> Any help is appreciated!
>Sorry to be the one to tell you this, but it isn't
disappearing. It is
>leaking past the seals into the automatic transmission.
>is auto.) Likewise, the auto tranny fluid is leaking back into
>final drive. I refer to this as "swapping spits". The final
>doesn't hurt the tranny, just makes it stink when hot.
>red, auto tranny fluid is too thin and the resultant thin,
>mixture is not good for the bearings. If you are hearing
noise, it may
>be time to get out the Bentley and read about rebuilding or
>bearings in the final drive.
There was a TSB from Audi ( or even a recall, I don't remember it
exactly ) because differential oil put in factory was actually
_evaporating_ ( my Haynes manual shows there is a 'breather' on the top
of differential housing ). And as far as I know, when the seal between
diff and autobox is defective, the diff oil level _increases_ ( the ATF
flows from the autobox into diff ).