I have a 93 idi 4x4 Borg 13-56 3.55s 9.00 16 tires with yet another smoked E4od this is the 5th Tranny in 100k have had a couple diffrent builders with the 4r100 upgrades they don't hold up. I haul heavy off-road frequently and im wanting to do a full custom adapted 6 speed medium duty such as a fuller, eaton, spicer with divorced t case. Have done this before with gassers but out of my league on what tranny to look for with close ratio and a tall final gear any suggestions at all?