Originally Posted by mwill00
So under load would be to jack it up and put stands on the differential then loosen the bolts and re-tighten.
I'd put jack stands on either side of the axle tubes instead of just the diff pumpkin but yes.
You'd jack the vehicle up. Place the stands under the axle tubes (preferably towards the ends, then lower the car until the jack stands under the axle tubes are holding the weight of the rear of the car.
For pinion angle you would also either need a pinion angle gauge or a plumb-bob and protractor