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I am using straight Redline lightweight shockproof in my trans, and it seems to like it. Lightweight shockproof has the film strength of 75w140, but lower fluid friction.
The problem with heavy normal gear oil is it normally sucks when cold, and has higher fluid friction which robs horsepower.
Wow I sound like a Redline oil brochure.
But alas, don't run that junk in your trans! Buy some good stuff, it's not like you're going to change it anytime soon. PM me if you don't have a local retailer.
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