Dave,
I got this off the RL website re: 75W-90 gear oil.
"Our most popular gear oil, this is the preferred product in nearly all car
and light truck differentials, both conventional and limited-slip. 75W90 is
preferred for most racing applications. It contains friction modifier which is
recommended for limited-slip units. 75W90 Gear Oil can be used in many
transmissions and transaxles; however, other Red Line lubricants have
better frictional properties for rapid synchronization. Exceeds API GL-5."
http://www.redlineoil.com/products_gearlubricants.asp?subcatID=20&prodID=60
Sounds like this is appropriate for Healey diffs ... am I missing something?
bs
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Bob Spidell San Jose, CA bspidell@comcast.net
'67 Austin-Healey 3000 '56 Austin-Healey 100M
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Subject: Re: lubricants
> Hi Bob,
>
> I think most of your suggestions will work. Everyone seems to have their
> own "pet" ideas on the subject.
>
> I disagree with the RL 75W-90 in the differential. This is a API GL-4
> rated oil & specifically says on the bottle "do not use in a rear wheel
> drive differential which requires a GL-5 lubricant". GL-5 has more
> sulfur additive which the high contact pressures in the differential
> require. Hypoid gears have a lot of sliding pressure contact. All but
> the early BN1's have hypoid gears & should use GL-5 rated lube.
>
> On the other end, sulfur compounds in the transmission are thought to
> shorten the life of the "brass" synchro rings so a GL-4 oil is usually
> used as you suggest.
>
> Dave Russell
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