Add to what Barry said, the fact that there have been certain cars
produced through the years that have the gearbox built into the bottom
end of the engine and they use the same oil for both purposes.
Joe
Barry Schwartz wrote:
>
> >I don't understand where the use of motor oils in transmissions is
> >coming from. I have heard of people adding sawdust to their
> >transmissions to quiet them down to but that doesn't mean I am going to
> >do it. Using motor oil may be some mechanic's short term solution to a
> >bad rebuild, I don't know.
> *****************************************
> I believe that the motor oil usage, related to British cars in general,
> stems from those who have or have had MG's. Certain models of MG's (* see
> below) use regular motor oil in the transmission, which is (also I believe)
> specified in the service manual, for use in those trannys. (those who own
> MG's can validate that for me, and we KNOW who you are. . .:-})
> However there may be specific differences which allow it's use in
> those boxes. I would gather though, that the rear axle still specifies
> that hypoid gear oil be used (and for good reason). The load's imposed in
> that assy are far greater and the shearing action of the hypoid gear is
> much more severe. I'd bet that using motor oil in the rear end would lead
> to a very early demise of the ring and pinion. It is interesting to note
> that while hypoid gears have a much more aggressive "sliding action" over a
> broader area of gear teeth by their design, helical cut gears still do the
> same thing, but to a much lesser degree. It would also be interesting to
> see if the trend of using motor carries over to the later Midget which uses
> the Spitfire/Marina single rail gearbox. I'll bet that it specifies gear
> oil for those :-)
> As for the sawdust, that's an old sellers/bad mechanics trick to quiet a
> noisy transmission to sell, or get rid of the car, without fixing the problem-
>
> *and quite possibly other models. My Borg/Warner T5 five speed manual,
> specifies ONLY Dextron II/III automatic transmission fluid [fluif] be used
>
> Barry Schwartz (San Diego) bschwart@pacbell.net
>
> 72 PI, V6 Spitfire (daily driver)
> 70 GT6+ (when I don't drive the Spit)
> 70 Spitfire (long term project)
--
"If you can't excel with talent, triumph with effort."
-- Dave Weinbaum in National Enquirer
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