Yes. All the manuals Dodge used (Getrag, NV4500, N5600, G56) will easily bolt to any BT. You will need the correct engine-to-transmission adapter...there were at least three different ones.If I was to go the 6BT route I would probably go the route of a computer-less motor. Would I be able to bot up a NV5600 6 Speed to an engine that old?
From his description of his ideal truck...it sure seems he will be open to serious sheet-metal alteration. Based on what he wants, I would start with a F350 dually which came with a Diesel and a ZF 5- or 6-speed.Have to be careful on the old style trucks. A 6bt is very large. Have to consider things like radiator and intercooler. Also, those are very wide and the engine compartment on some of those old trucks is very narrow. A 6bt can be a tight fit even on some modern pickups.
12 valve isn't that big.
Yes, it is that big. It's a tight fit in some modern full size pickups. This guy is talking about a vehicle from the 1930s or 1940's. Those engine compartments were very narrow. One of our members put a 4bt into a '32 Chevy and couldn't use the hood side panels.