Correct me if I'm wrong but if you just lower one end of the spring doesn't that change the pinion angle? I tried it and it did on a Dakota I use to have. I didn't like the huge angle change (4* if I remember right) and put the stock hangers back on and installed aluminum lowering blocks I bought at Auto Zone. They didn't change the angle but about once a year they would split in half. I finally made some from 2x3 rectangle steel tubing and never had any problems again in the last 5 yrs. I had the truck.