rear end help

Hey, I am a new member and this is my first post. I purchased a 1994 gt project car that I have been working on for the past 5 months. The car has 104k on the dash. So far I have started out by getting the chassis and drive line ready for more power. In the front I have replaced the rack and...

Something is wrong with my 95 GT. It drives fine in 1st - 5th gear and no problems going forward but now when i put it in reverse to back up its acing like something is stopping it and kills the car. It started off once acting like something was dragging and barely was able to get it to reverse...