purchased new, never liked the shifting, 95k miles, overheated on the highway had to get towed home. added thermal bypass, had fluid flushed at dealer. truck was shifting hard and sloppy with lots of torque converter shudder on the way home. did not drive it afterwards. took a chance it was just the torque converter and purchased stock 1600rpm, went for a drive today and it was so smooth and shifted so well, temps are in the 160's. thank you Monster for the advice on the phone and having the parts I needed available and on sale. I am very happy all around.