I have an old revo 3.3...about 10 years old. I bought a rear brake kit and slipper clutch eliminator and neither fit. The rear shaft that the brake is supposed to go on is too short and does not have the hole for a pin to go in. The slipper clutch eliminator...once installed pushes the gear out too far and I can't install the trans back in....what do I need to get for these to work???