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Harvey Tank

R10 overdrive oil

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ditto to what he said, and the why:

 

 

Most lubricants for manual gearboxes and differentials contain extreme pressure (EP) additives and antiwear additives to cope with the sliding action of hypoid bevel gears.

 

 

EP additives which contain phosphorus/sulfur compounds are corrosive to yellow metals such as the copper and/or brass used in bushings and synchronizers; the GL1 class of gear oils does not contain any EP additives and thus finds use in applications which contain parts made of yellow metals.

Edited by shel_ny

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I just had my 1939 Borg Warner R~6 with overdrive gone thru and 10w 30 was recommended... 

There is A~lot of good info out there on these trannys!

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Just had one done by George A.  He recommended 15w40 synthetic motor oil (specifically Amsoil diesel) Don't know the how and why of using motor oil in the trans.  I always thought that the deal with gear oil was the thickness allowed it to cling to rotating pieces,where engine oil would be slung off.  And what synth?

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