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This is for a street driver, no racing, with an occasional Jungle Jim style burnout. FSM says 140 or 90, but since I have enough ATF4 on hand I thought I'd seek some input

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I have owned many Mopars with NP 833 4 speeds in them that had ATF in them from the factory ATF will work excellent and make the trans. shift a lot easier than 75-80W gear oil will Especially if you live in a area that has cool to cold weather A 727 trans have a lot more gears and pressures internally than a NP833 does