Man that sucks but to be competly honest that is a LOT of weight for that transmission to pull and get moving and some pretty big tires so u really can't expect that weak transmisson to hold because even a fully built one can only hold 600 hp and that's in a light car u but the same one in a 7000 lb truck it WONT last with my kind of power trust me I've gone through 5 before I did a 4l80e that is the only way u will ever get that truck to not go through trannys like crazy They are more expensive and it does take some work to get it in there but it is totally worth it