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  1. DeuceNewb

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

    I generally try to keep it around 2k, but i find that it keeps wanting to creep up, crusied for a while at 21, but every now and then going down hill it would just want to go faster and get close to 2300. guess i'm just trying to convince myself I didn't hurt it
  2. DeuceNewb

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

    can somebody tell me what the maximum safe rpm, or redline is for the 250? both my trucks have had no stickers on the tach, and the ones i see on gl differ from 2,000 to 2,400. I know the peak power is 2,100 but what about about a safe cruising rpm
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