rear pinion angle

I have changed my springs over to the yj springs. They are 2-1/2" lift springs, but sit closer to 4" of lift. I also moved back the rear axle 1-1/2". I need to change my spring perches over to the wider ones. The pinion angle is sitting at 5 degrees right now. My question is, since I'm replacing the spring perches anyway do I need to change my pinion angle? And if so what should I set it up as?
Thanks,Rob

 

You need the u-joint angle at the transfer case the same as the u-joint angle at the pinion unless you are running a double cardan joint.

 

Thank you Nickmil. I knew someone would know the answer.