Edward, I just installed an overdrive unit and tranny and I am runny 80/90
gear oil. Ya know the manufacturer specifically recommeded this and I have
heard alot of people speak harshly against put other fluids in there. I
would pursue with a great deal of caution.
Patrick.
At 04:42 PM 5/29/98 -0400, Edward Hamilton wrote:
>Prior to removing the tranny and replacing the clutch on my '80 Spitfire
>(about two months ago) the overdrive unit seemed to work perfectly.
>Until last night, I thought I had a slipping clutch -- which I'm now
>convinced to be the overdrive. While removed, the only thing I did to
>the tranny and overdrive was to drain the fluid (no idea what was in
>it), clean the filters and top it off with the specified 85-90 GL/4 gear
>oil.
>I've spoken to a reported guru of gearbox/od units who tells me he never
>puts 90 wt. gear oil in them -- too slippery and can cause the unit to
>slip when in direct drive. Says he has always put straight motor oil in
>-- 50 wt. His suggestion to me is to drain the unit and fill it with
>regular automatic transmission fluid, run it for a few miles and drain
>again -- the A.T.F. to help clean out the 90 wt. gear oil. Then to fill
>the unit with straight 50 wt. motor oil. He offered this suggestion
>prior to my sending the thing to him for a rebuild, so I believe he has
>my best interest at heart.
>Would like to know if any other listers have had this type of problem
>and/or comments regarding the above. In other words, what do you guys
>have in your gearbox?
>
>Best regards,
>Ed Hamilton
>
>
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