I own a 1999 Ford Expedition Eddie Bauer Eddition, 5.4 L V8. My wife went into the garage to back it out and it won't budge. It acts as though the parking brake is set, but it isn't. If feels like the back left wheel is jammed and won't move. I was able to hit the gas while in reverse to get it to move a little, however there was a grinding noise the enter time it was moving. I was then able to drive forward without the grinding noise until I heard a click or pop come from the back wheel. Then it seemed like the truck was jammed again and wouldn't move. Does anyone know why this is happening and what I can do to fix it? Please let me know. I'm not sure if this is a brake/wheel issue or transmission problem. Any help would be great. Thanks.