The best way to determine what is wrong, is to measure the fender to floor distance directly above all four tires, on the axle centerline.
Then place the frame on jackstands, with the stands in exactly the same position left to right, in both the front and rear. Measure each fender to floor distance again. If the lean is the same, the problem is in the frame or body mounts. If the lean goes away you have a problem in the suspension.
Worn shocks have no bearing on the ride height, unless they are gas shocks and one is bad. The good gas shock will tend to raise the suspension while the flat one won't do anything. If they are not gas shocks they will have no effect.
I put four new springs and all new suspension pieces in my truck and after about a year is also leaned about an inch to the drivers side. I determined it was the left front spring being weak. Rather than going to all the trouble of replacing the springs again, I installed a race rubber in that spring only, and now the truck sits dead level. The following link shows the type of spacer, I don't remember where I got mine:
http://cgi.ebay.com/ebaymotors/Dual...torsQ5fCarQ5fTruckQ5fPartsQ5fAccessoriesTo install it I had to remove the upper rebound bumper, then jack up the frame to allow the suspension to fully relax. It quite a chore, but it simply slips in between the coils and increases the spring rate on that corner.
