Thread: Wrong Gear Oil?
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Old 09-15-2021, 07:28 PM   #9
nkaminar
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Default Re: Wrong Gear Oil?

Mitchell recommends 85W-140 GL5 gear oil for their transmissions and overdrives for the Model A. Oils have come a long way in 90 years and the modern oils have additives to maintain the oil film under pressure. The 85W-140 is fairly thick oil. I use it in my transmission and rear end.

If the transmission is too full it will leak. New gaskets and seals will stop leaks.
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