Has anyone done this yet? My son has a 1969 Duce and a half that the dual fuel engine is questionable at best. He would like to put a 12valve Cummins in it if it would fit. My guess is it would, easily. Could he use an automatic transmission?

 

Should be a cakewalk. I believe the military trucks use SAE bellhousings, so get the right adapter and it should bolt in.

A truck that big would require a truck auto, perhaps an Allsion?

A place like steel soldiers would probably be a better place to get transmission advice.

 

I'll pass that info along. Thank you.

 

Ide drop a 250 cummin's in it there are plenty around ready to drop in guy bought a bunch of truck's out of Barstow Base but had to cut them up so he has a bunch of motor n trans Packages available . PM me if your interested in info .

 

I'll pass this info along also since the engine in my son's truck is running like crap. Probably bad injectors, even though we just had six new (rebuilt) ones installed.
Thanks a bunch.