I've only had the car since november of 2015 so I dont know what has been done to the car. It has a 727 torque and a 8 3/4 rear end. When I put it in reverse it makes a big thump and it lunges backward, and same when I go into drive. Even when the brakes are applied it moves kinda like getting hit by another car at very low speed. What do I need to look at/for. If you need more info let me know. Thanks