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  1. Beerslayer

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

    Thanks to the link to the Combine Forum, there are good photos of a dual fuel line setup on the third page of the post. Looks simple, think I'll try it.
  2. Beerslayer

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

    So how about that Allison MT 654? Will it stand up to 350/400 HP? Allison says it is rated for 300 HP and 960 ft lbs torque? Thoughts on this? I don't mean for heavy use, but as a hobby truck, occasional hauling driven reasonably. How tough are those Allisons?
  3. Beerslayer

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

    Really. Thanks for the long ^^ winded reply, great information. My use would be occasional, not daily, so turbo and bigger injectors would probably be fine. I won't be working it hard and I drive my rigs easy. So any thoughts on the Allison MT 654 and 350-400 HP? I know they put the MT 750...
  4. Beerslayer

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

    Ouch. What a shame chopping them up like that. I had been watching the auctions for 400s in the crate, but better to get one out of a working truck with a matching transmission. I like the idea as I could also get a front spring back and shackles at the same time. Please don't ask what sort of...
  5. Beerslayer

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

    The flood of M939 series trucks has started, and we have a new toy to play with. After having read ~all of the related threads on M939 series trucks, motors, transmissions, there seems to be some room for a separate discussion of how to get more power out of the NHC 250 when it is installed in...
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