My car is a Chrysler Concorde 1994 engine size 3.5 about 97,000 miles and i love my car but when i go in reverse it makes this sort of jumpy clack clack clak noice i dont know if its because the engine jumps too but im not that concerned about it but the revers im concerned about. I need to check the breaks in baout 2000 miles but what can be wrong???