Ok, my 99 ATX has 57700 miles on it, 2 days ago, i put it in reverse and it didnt move, i put more pressure on the gas, rpms went up to 2, and then it jerked back. I took it to the dealership, they cant find out whats exactly wrong with it, but i need a new transmission. Im taking it today to the shop, my question is, do i get it rebuilt, or get a whole new one? Thanks!!