so i have a 97 gmc 2500 4x4 with the 6.5td in it, and it requires a change. I found a 6.2 what would i have to do to change it in the 97. My truck currently has a 4l80e trans. Do i need to change the trans? I know the 6.2 will bolt up to the trans, but how do i control the shifting of it as its a electronic? Is it just swap the engine into the truck and go or do i need to fabricate parts for it to run? IE throttle linkage. Can i leave it as a mechanical pump or do i need to change it to the electronic one? The 6.2 was running when pulled. what electronics do i need to make the trans work. or do i need to change to a different trans.