Re: V10 to 24V diesel conversion
If you do the swap, go with the 12 valve engine and get the automatic built for the diesel. Your truck will accept the electronics and wiring harnesses from the 96-98 years with no problem. The 98.5 and newer 24 valve electronics will present you with a huge problem in your dash, brakes, and electrical system of the cab.
Your frame is identical, the springs are adequate, and you will have to either build a pressure regulator for the in-tank fuel pump of the V-10, or remove it and use the pickup system for a diesel. You can use the in-tank pump, but add a bunch of filtration between it and the diesel' lift pump.
Do not try to reuse the gas automatic, as you will have a number of valve body changes and friction swaps to do, along with the torque converter. The ECM on a 96 diesel will not interface with the gas automatic without a logic change, and the PCM will have to be swapped for a diesel version anyway.
It will be much more cost effective to just get the diesel transmission ready to roll, and already bolted to the engine.
You will need the diesel motor mounts.
Any comments, suggestions, or instructions offered by me only apply to off-road and non-emission regulated use. Anytime I ever used or may use reference to highway performance, it is purely as an academic reference only.