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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...- 162tcat
- Post #94
- Forum: 5-ton Mods and Hot Rodding
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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...- 162tcat
- Post #92
- Forum: 5-ton Mods and Hot Rodding
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More Power From NHC 250 in M939 Series Trucks With Allison Transmissions
Also, no smoke so I could probably drop to a lower number.- 162tcat
- Post #90
- Forum: 5-ton Mods and Hot Rodding
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More Power From NHC 250 in M939 Series Trucks With Allison Transmissions
#20 button here, egt around 980 under load.- 162tcat
- Post #89
- Forum: 5-ton Mods and Hot Rodding