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Why not try to keep the stock np242?

Not sure about all but all hmmwv but I believe most have 3 basic drive modes, normal mode is a type of AWD with 52/48 split between from and rear, true 4wd which they call HL and a true 4wd low range they call L.

No I want to use the 47rh that came with the cummins. It’s a decent trans and has a good overdrive. The th400 doesn’t have overdrive. I mean awd as in, well, maybe I’m using wrong term, but to me a center differential 4wd is better described as AWD. Then when center locked it’s 4wd. Hmmwv...

One of the big questions is if I will be able to retain AWD with the 47rh. I’d like to keep AWD but if I can’t then a different t case will suffice. Having an intercooled turbo 5.9 will be a huge upgrade for the old m998.

I wish it was endless but it seems only a few have done it with documentation. Anyway I’m gearing up to do a 12v with a 47rh overdrive trans. Wish me luck!