Front end leans

[379redneck]

Anyone know what would make the front of my truck sit crooked? The left side sits lower than the right in the front. Right now I dont have matching shocks on the front, the right has the factory style dual shocks and the left has one skyjacker shock that should be used with an aftermarket dual shock kit, but it leaned before I changed them. It used to be set up the same way but with the factory shocks, but I only had a single shock on both sides for a little bit and it still leaned. So no matter what I do with the shocks it wont sit normal. Could this be because the front leafs are worn differently? They are to the point where they are arched the oposite way they should be. The frame is also bent a little bit in the rear, but I would think that would make the back sit crooked not the front.