I have a 39000 mile lmm sitting on a pallet in the garage out of a wrecked truck. I have been looking for a truck wth a blown motor to put it in. I found a lly with one but can I use the lmm in the truck. I know it’ll bolt in but what will need to be done. I would have both complete trucks and harnesses. What about using the 6 speed instead of the 5 speed Allison?