rear shackle location

sorry, let me clarify, as for the pinion I wanted to know a way of getting a factory setting without the trans installed there has to be an acurate way because the factory did it. i was just wondering what was the most acurate places to measure from but I probably will wait on the trans to be sure. As for the front spring hanger when i compared them to each other they re not in line. I used a dowl through the bolt holes from one side to the other. The drivers side is more forward than the passengers side. and they both angle in.