Pinion angle

[rallye bob]

This is all contingent on the way that your rear is attached to the frame IE ( rubber will move more than poly, and poly Will move more than solid mount) Ideally you want your rear pinion angle, and your trans angle to end up parallel under load. So you say your trans is 5* down. Depending on how much your rear pinion will move up under load, you want it to end up 5* up (trans and rear will be parallel)..... So I would say that you should start with your pinion at (from) 0* to 2* up... Then under load it will move up a few degrees, and get it to the 5* up that you want.
This is kind of confusing..... ;-)