Three weeks ago I purchased my first cummins powered vehicle, a 1997 2500 4x4 automatic with 220000 miles on it. The truck was an old man one owner all stock rig when I bought it, I added a BHAF, straight pipe, and 100hp fuel plate from ebay. The truck pulls very strong now but I am worried the transmission is going to grenade very soon with so many miles and now the power adders. Who builds a transmission that will hold say 400hp/800tq?? I will be adding 3k spring kit, 370 injectors, and a complete 4" exhaust soon and want to have a transmission picked out... ...