Did my 7.25 take a crap?

Curious, did it do it before you put the spring on? Was the car able to move under it's own power before? If it's making a noise in the rear maybe something came loose in there. Sound has a funny way of traveling and can be hard to track down sometimes. I guess I would try to figure out if the driveshaft will turn in gear without the car moving, if not I would look at the trans for the source. Start the car, put it in gear and have someone watch the drive shaft to see if it's turning, without the car moving.