[AT] Transmission/Differential Fluid

[Jim and Lyn Evans]

I use 80-90.  Walmart was closing out 5 gallon containers a few months ago.
$10 for 5 gallon of gear oil.  I bought it all. :) 
Too bad it was only 20 gallon total.

If you want to use a lighter oil, use hydraulic fluid similar to a John
Deere J20C spec.  It is hydraulic oil, but has additives to take the
pressure of the gear meshes.  It is what all the tractors use now.   I don't
think automatic transmission fluid will have the extreme pressure additives
in it.

Jim 

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dudley Rupert
Sent: Thursday, April 15, 2004 7:19 PM
To: Antique tractor email discussion group
Subject: [AT] Transmission/Differential Fluid

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

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