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  1. gunner01

    More Power From NHC 250 in M939 Series Trucks With Allison Transmissions

    your allison tranny is under rated by about 25% . You should be able to safely put 350-375 HP to the tranny. remember that driving conditions and driver conditions vary. that being said if you are the sole driver and you dont try to impress people with this truck by doing stupid things ie...
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