when my car rolls backwards very slowly, it makes a loud squeaking noise, only in some spots, almost as if something is rubbing but only in a certain spot, it is loud enough to hear in the car when the car is running. i just had my gears done so i dont know if it is something in the rear end, but it only does it while rolling backwards and very slowly wheather the car is off or on it doesnt matter. it almost sounds like one of my brake pads is rubbing to much on one side, when they did my gears i thought they might have switched my pads by accident an they werent worn into the right rotor like they used to be. but i have no clue what it could be and it is driving me nuts, it just started, and it did not do it when i first got my car back from the shop. anyone have any idea what it could be? on our cars when you do gears, do you have to grease the axles before you slide them back in so they spin smooth or are they lubed by the differential fluid? thanks