<VV> Trans fluid (manual)

[N. Joseph Potts]

I distinctly recall that the automatic transmission AND the (integrated)
differential in my 1992 Plymouth Voyager ran on ATF. Now, this does NOT
satisfy me that the Corvair differential would be happy running with ATF,
but it DOES raise the question in my mind: what's the difference between
differentials that ARE happy with ATF and those (like the Corvair's) that
are not? Anyone know?
     On a very closely related matter, my query of a couple of days ago to
the group concerning Red Line or other products that might reduce the
crunchiness of my 1966 Corvair four-speed got one answer, recommending
AMSOIL, which I am currently using. But I got onto the Red Line site and
spotted what looks like the perfect product for me and anyone else with the
combination of a "Saginaw" (1966-1969) transmission and NO Posi-Traction.
This is Red Line's 75W90NS Gear Oil. The blurb on this product states that
the ABSENCE of posi additives (indicated by the NS in the name) from this
lube IMPROVES the ability of the synchros to grab hold and do their job.
Meantime, the rest of the description suggests that it WOULD also handle the
needs of the differential satisfactorily. Does anyone have any experience of
this product or (to repeat my question of a few days ago) any other?

Joe Potts
Miami, Florida USA
1966 Corsa coupe 140hp 4-speed with A/C

-----Original Message-----
From: virtualvairs-admin@corvair.org
[mailto:virtualvairs-admin@corvair.org]On Behalf Of NicolCS@aol.com
Sent: Friday, March 19, 2004 12:31 PM
To: virtualvairs@corvair.org; flash@vicspdi.com
Subject: <VV> Trans fluid (manual)


Use of ATF in a Corvair transmission is a NO-NO in my book.  The trans would
probably be happy enough but since the transmission and the differential
*Share* fluids, I believe you would have a trashed differential in short
order.
ATF does not have the EP (extreme pressure) quality that differential gears
require.  My GMC motorhome has an automatic transmission bolted to the
differential.  When the seal that isolates the fluids fails and ATF enters
the diff, it's
all over.  It happens all the time.   Others may agree or disagree but this
is my take on the matter.
Craig Nicol
66 Monza 140 EFI, 65 Corsa 'vert 140 EFI, 67 Monza sedan 140-4