the correct drive height is when the rear cv axle shafts are in straight plane from differential to the hub.

Another way to measure is to use a tape measure from center of wheel to edge or body panel.

I use both measurements and eyeball the axle shaft and if the car starts to lift off the jackstands then a couple of heavy cement bags in trunk can weigh down the car and compress the suspension just enough to get your desired height.

OR

you can remove the spring and wheel, tighten everything up - once done then install the spring link arm - and then drive it on ramps backwards and tighten that down - its the lowest point of the rear suspension.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)