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When I did it I measured height from center of wheel hub to bottom of fender arch, using a small level, before starting anything. Removed and reassembled everything hand tight with vehicle on jack stands, then used level again and a jack under the wheel hub to get it to the same ride height, then torqued. Removed air suspension so didn't have that step. Bottom control arms you don't even have to remove the wheel to access easily, just the uppers. Had to retorque after alignment when checking things because the shop only torqued to about 30 ft lb instead of 155, and for that I just put the jack under the tire itself.