Since this is a GM board, I'm sure I'll get flamed for saying this but, *if* I were interested in converting *to* a diesel (I'm going the other way) I would try to go out and find a Cummins TD with tranny from a 2500/3500 Dodge. Personally, I think that is by far the best diesel available in a truck. That way, you could get the engine, tranny, and tcase all together saving a major hassle there. However, stronger front suspension (diesels are always much heavier), fabricating the mounts and x-members, figuring out the electronics and a host of other things remain.
You would certainly be better off just to go out and buy a complete diesel truck of the right model. Then, move your upgrades and custom stuff to the diesel replacing your stuff with the stock diesel stuff leaving your old truck complete. Then sell your old truck. This should leave you much better off in money and trouble.
Bad Dog
85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.