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  1. simp5782

    M813 855 to 8.3 Cummins swap

    It'll last a few months at that power rating There is a 8.3l power thread in the hot rod section. Gear ratios for the 5 ton Rockwell range from 4.10 to 11.26. Finding them isn't easy though. Sell the 8.3 and nhc250 and buy a big cam and a 10spd and go from there. The 8.3l is a few ft...
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