I cant figure why my truck is leaning to the left. when you look at it from behind the passenger side is slightly higher than the driver...

 

My 04 had the same problem, the front had a compressed bushing that needed to be replaced, it was a TSB that was replaced out of warranty for free. Dont let them tell you that its because your gas tank is full, I had them print out the procedure for fixing the compressed bushing and it says to weigh the truck down to simulate a full tank. So a full fuel tank most likely is not the problem.