'88 90Q Trans/Ceter Diff questions

[Huw Powell]

> I'd like to change the trans fluid in a 1988 90Q but don't know the
> quantity
> nor type recommended for this application.  Input would be appreciated.

It takes almost 3 quarts/liters of hypoid gear oil, 80 or 90 weight, not
sure which.  I think I have used 80w90 in the past.  I also used Mobil
One synthetic with no apparent trouble.

Loosen the fill plug before the drain plug.  After draining, replace
drain plug and fill until the fluid is level with the fill plug.

> Alos, regarding the diff locks - on this car, there is only one light
> indicating locked diffs - is there only the lock at the rear diff?

Yes.

 >  Does the center diff have a mechanism, too?

No, it is "auatomatic", as I recall from voluminous discussion on this
list, it can transfer up to 90% of torque to the front or rear when it
"senses" slippage at the other end.

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/