Chief_919

What model HMMWV is it with the 6.5? Turbo or NA? What transmission?

1. If it is a NA truck with the THM400, you will have a bolt in.
2. If it is a turbo truck, you will have to swap out the heads and intake to keep the turbo, as the NA engines and side mount turbo engines used one set of heads, while the center mount turbo engines used another. If the 6.5 is blown and the heads are bad a set of heads from a civilian 6.5 in a van (and only the vans) will fit. The intake studs for the manifold in the center mount turbo are at a different angle to make room for the turbo.
3. If it has the 4L80E transmission you will have to swap out the TPS on the injection pump and recalibrate it. I have the instructions on that if you need them.
4. If your truck has the serpentine belt you will have to swap out all the accessories on the front.
   

Hope this helps a little. I have done about ev er manner of HMMWV engine swap out there at one time or another, from shoehorning a 6.5 turbo in a M998 to putting a CUCV 6.2 in a M1114 with the turbo on it.

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