Okay. My car's rear diff is shot. I got a flat and didn't realize it (yes slap me) and i screwed it up. how much would a new rear diff cost? and for all you that ask symptoms of my car, i have to barely press down the accelerator to get it to go and if i press to hard it sounds like i am reving my engine. it takes a life time to get the car to 30. anyone got some advice or help?