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  1. 1

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

    Sounds about right. I think 20 is about the best balance of power and reliability. I haven't done much testing but I would imagine when you get into the lower numbers you'll have to be more aware of your EGT gauge while towing or pulling a long hill. Have you added any shims to the governor...
  2. 1

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

    I'm currently running a T50 from a 335. I was running a HT3B but it was tired and needs a rebuild. Didn't really notice a difference when I switched other that no burnt oil smell. Next plan it to run an air to air IC and bump the power a little more. I don't see and reason why it wouldn't...
  3. 1

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

    Also, no smoke so I could probably drop to a lower number.
  4. 1

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

    #20 button here, egt around 980 under load.
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