I have a 2003 dodge 2500 4x4 with the ISB 235 cummins (california model). It has a smarty, intake and exhaust. I know these trannies are'nt the strongest stock, so i keep the smarty down on SW3, or SW5 with stock torque managment. Transmission feels like it is slipping pretty bad, especially in second gear. Then i noticed that if i lock the torque converter by holding the truck in second gear and going fast enough for the computer to lock it, the trans dosn'ent slip at all! Same for 2-3 and 4th gears.....if the converter is locked, it dosen't slip and feels great. If the converter is unlocked and i take off from a stop with moderate-heavy throttle.....the tach will just sit at 2200-2300 rpm and the truck will shift into second and third without any drop in rpm. Definetly slipping, like a high stall speed converter in a drag car. Is it possible that my converter is wasted, but the lock-up function still operates? Do you think that my transmission is fine, and it just needs a converter? In that case, what is a good converter to put back in it without completely breaking the bank?