Great kit if your going to use the A727 variant. We are going to go with a 42RH A904 variant. Doesnt say it will work for that. I have looked at different kits. Not sure what the difference is in the 42RH and the 46RH except that one is A904 based and the other is A727 based.. The 42RH will fit a bit better size wise, and has a numerically lower first gear ratio than the 46RH. Its going behind a hopped up teener with a 3.73 rear so i dont need the heavier duty version. The 42RH can be built to handle additional HP.