well i picked up this 98 12 valve and a diesel performance guy here tuned my pump modded the afc put 4k springs on it in 2 weeks hes gonna put a 4 inch back exhaust and guages now my worry is the transmission what T/C should i get will it extend the life of my transmission.... mind u the truck was bone stock till i got it it has 215k miles and its 4x4. im asking here rather than asking him is cause i want to see what u all have too say thanks i appreciate it