New 66 C10 project suspension trouble?

[Mikes66ChevyC10]

So tonight I put the truck up on Jack stands in order to remove the bolts holding the bed on the frame as some friends are coming over tomorrow to help take the bed off. When I got under the truck I noticed a potential problem. The pass side Rear wheel is rubbing the inside of the bed and the drivers side has plenty of room. Looks to be about a 3/4 inch difference between the pass side and the drivers side. What could be causing this? Should I be worried? I also found that the truck has a one piece driveshaft and where it passes through the cross member it is not centered.

[Goats86]

When you raise it up the panhard bar pulls the rear end to the side. This is normal. Drop it down and that distance should be about the same. Most panhard bars for drops are adjustable for this reason.

[Mikes66ChevyC10]

Originally Posted by Goats86

When you raise it up the panhard bar pulls the rear end to the side. This is normal. Drop it down and that distance should be about the same. Most panhard bars for drops are adjustable for this reason.

Thanks for your reply. The Jack stands are under the rear end so it's like it's on the ground with the weight on the axle/wheels. I think the problem is the box is off center. When I measured today from each wheel to the frame the measurement was the same so the rear end is centered. When I measured from the frame to the outside edge of the box it's off from one side to the other. Going to double check this when I get the box off.

[Lowl!f3]

A watts link will do a better job on holding the rear in the center For you. So if you put one in you will be all go from there.
I don't like pan hard bars