driveshaft angles

You have to understand how it's done. Every single stock Mopar rear axle will measure between 2-5 degrees pinion down in relation to the spring perches, from the factory. When the rear axle is installed on the springs, then you measure relative to the drive shaft angle. So normally, when you set the perches with the pinion 5 degrees down relative to the GROUND, it ends up about perfect when installed, since normally, the drive shaft angle from the transmission is between 2-5 degrees, depending. Then if you need to fine tune (I rarely have had to) you can use pinion shims under the perches. Geeze yall, this is grammar school geometry. It's not difficult.