Setting pinion angle after lift kit

[OnABroncoRide]

1986 Bronco 2, 4" lift using springs, not blocks. 4x4, with either 7.5 or Explorer 8.8 rear end.
This forum has great input on the necessity and how to measure and set pinion angle.
What I have not read, maybe I missed it, is whether or not the rear suspension has to be under load when measuring the pinion angle. I'm not sure it matters, but thought I better ask.
Thank you.

 

[ericbphoto]

Yes. Complete vehicle resting on suspension preferably on a flat level surface. Just the way it would be sitting in your driveway.

 

[sheep herder]

Yes. Complete vehicle resting on suspension preferably on a flat level surface. Just the way it would be sitting in your driveway.

My driveway is not flat or level.

 

[ericbphoto]

Neither is mine. My garage floor isn’t even level. Water will run out the door