Squaring up the rear end

[KMAT]

Can someone please give me the proper way to Center and square up my GM rear end on a 67 Chevy C10 I put a 5 inch drop kit on the back and does not seem that my rear end is square with the truck. I will try to attach a picture to this thread and if you can notice that the pinion angle points towards the passenger door somewhat. Any help would be much appreciated that is why I joined this awesome site