Joe's been rebuilding o/ds with specific clearances in the pumps....
configured for 30wt.
Shear specs/additives for gear oil mess with the bypass valve for the
pump and seals he uses.
My Triumph J and D o/ds have been running the oem spec'ed Hypoy 90 for
100's of thousands of miles without issue.
Yes I rebuild my own and know what the pressures obtained are. ..and yes
I set my shift hubs on the high side of the spec. :-)
Yet in my MGs with a Laycock LH type o/ds I've always run the spec'ed
straight 30wt .
OBie now has 225K miles on that o/d without issue.
30wt straight and 80 wt gear are approximately the same viscosity. It's
the shear additives, temperature range and other additives that
differentiate them.
ymmv
ptegler
On 12/1/2015 8:49 PM, Jeff Scarbrough wrote:
> On Tue, Dec 1, 2015 at 7:38 PM, Greg Lemon <glemon@neb.rr.com> wrote:
>> The testing done by the guy whose name I can't recall at Quantum mechanics
>> seemed to indicate that EP could lead to pressure that was too high, and
>> possible failure. On the other hand people ran it for years when it was
>> recommended, and the gearboxes and overdrives seemed to have survived at a
>> pretty good rate.
> John Esposito (the guy you are thinking of) sent my rebuilt overdrive
> with a note that said using anything other than 30 weight
> non-detergent oil in the gearbox would void the warranty. That's a
> good enough reason for me to use it.
>
> Jeff Scarbrough
> Corrosion Acres, Ga.
>
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Paul Tegler ptegler@verizon.net www.teglerizer.com
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