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Doing something with the nhc 250
The thing that killed my Allisons was heat. Luckily on the A2 trucks they can cool the transmission better with the larger radiator for a smaller displacement motor as well as a Air charged cooler to supplement the heat exchanger. On a NHC250 towing in the summer months the fan clutch will...- simp5782
- Post #12
- Forum: 5-ton Mods and Hot Rodding
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Doing something with the nhc 250
I had a setup like this and I removed the blackout light and adding ducting to go to the air box. https://www.steelsoldiers.com/showthread.php?139835-M939-air-filter-mod/page5- simp5782
- Post #10
- Forum: 5-ton Mods and Hot Rodding
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Doing something with the nhc 250
$450 shipped.. If you want a dual fuel line setup to go with it add $150.- simp5782
- Post #6
- Forum: 5-ton Mods and Hot Rodding
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Doing something with the nhc 250
The allisons are junk and do not like high torque or high temps. Dual fuel line it. #16 button, adjust your rail pressure to around 175. Setup a ram air intake system and leave it be. It will do fine. You can get up around 300 or so out of just the motor. If you want to add a turbo go for...- simp5782
- Post #4
- Forum: 5-ton Mods and Hot Rodding