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  1. R

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

    Oh. Sorry. I have a thread going. I changed direction due to time constraints and added a turbo to a 250 for now. I am going to do the 290 in another truck now. 250 is running good getting ready for suspension and crew cab next.
  2. R

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

    About What?
  3. R

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

    Pulled a locked-up 250 out of a 925 tonight. Picking up my 290 tomorrow. I will start post when i get something to post. I have a cummins certified mechanic doing the work so i will keep everything as up to date and informative as possible for all of you thinking about doing the swap.
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