[payaso25]

What would cause my Ford 9" rearend not be able to turn backwards? You can easily roll the car forward. I thought it was something to do with the brakes, so I took off both calipers and rotors and just bolted the wheels to the axles. Still won't turn backwards. It will back up with the engine running but it feels like it is pulling a 4000 lb. trailer. Please help. thanks