These are excellent trans, I have one in a Suspension unlimited with 550hp to the wheels, It had a 2D and would have to repaired every other trip when I finally switched to the PBS, 10 years on it and decided to pull it to check it out. It was in very good shape. Just going to replace bearings and seals. I went with a PBS over the 4S trans because when switching from 2D to 4S you have to to raise the engine about a 1", that meant changing all the water tubes and other stuff. PBS was easy, just had the flip the rear trans mount. Axel had the same angle.