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1981 R754ST


Hobert62

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Well if that reads correct at 425 HP then it would have a 4MG or 3ZJ air to air. The 4MG didn't come out untill 1986. So I would think it probably has a 7FB 400 HP B model in it. And some installed that super ten in there. Those transmissions were not available in 81. Although it is a easy swap, the super ten is the same length as a 13spd. Heavy duty looking truck though.

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