[AT] Transmission/Differential Fluid

[Dudley Rupert]

I seem to recall - it has probably been a couple of years ago now - a thread
on transmission fluid versus gear lube in the transmission/differential of
older tractors.  While I know the manuals generally call for 80-90 wt gear
lube I seem to recall that some/several on the list indicated that they were
using automatic transmission fluid instead.  A couple of weeks ago I drained
the back end of a Farmall M - it definitely had thin, red looking fluid in
it.  I am now ready to refill and am thinking of using transmission fluid
instead of gear lube.  While I have drained six or seven tractors before I
have never yet refilled with transmission fluid.  So, I am curious - the
last time any of you refilled the back end of an old tractor (I have a T035
so know Ferguson's need a special/unique oil), did you use transmission
fluid (and if so what kind) or did you use gear lube?  I don't recall but
does anyone remember any drawbacks being noted from using transmission
fluid?

Thanks -
Dudley
Snohomish, Washington