<VV> Tranny/diff fluid levels

[Kirby Smith]

The simple thing to do is add the additive.  The experimental thing to 
do is test the positraction torque (I vaguely remember 300 ft lbs, but 
others more current may know better) with the diff cold and warm to see 
if it is in spec without the additive.

With respect to diff oil.  Modern 8Xw90 differential oils are usually 
GL5.  This stuff has sulfer compounds that eat brass syncros when the 
oil is very hot.  If your oil never gets hot, then no sweat.  Otherwise, 
  a sulfer-free type is better.  Redline makes some suitable stuff, 
forget which name, as do Audi directly, as quattros have the front diff 
and tranny connected.  Presumably, GM also specifies a suitable brew. 
Don't know about Amsoil.  :)

kirby


CorvairEd at aol.com wrote:
> In a message dated 7/21/05 10:58:23 AM Pacific Daylight Time, 
> ncwitte at wittelaw.com writes:
> Now that it is painted, I need to
> fill them.  Any idea how much oil to buy.  My recollection was that I need
> to fill them both from the diff cover until the gears are submerged, but I
> can't remember how much that took.
> 
> Norm,
> If it is a four speed transmission, it takes one gallon of 80w90 or 85w90 
> hypoid.  If you have a late model with the stub axles in stalled, you can add the 
> entire gallon through the differential lid.  The oil will flow into the 
> transmission by itself.  If you have an early model or FC you will have to pump the 
> oil into the transmission first and then into the differential till it will 
> not take any more after the transaxle is installed in the vehicle and the axles 
> are in place.
> 
> Ed Corson (CORSA member)
> Inland Empire Corvair Club