His crossmember is not upside down guys. The drop crossmembers are used when more than 5" of drop is desired in the rear and they mount the trailing arms higher to correct the pinion angle. You know it is not upside down because the holes for the parking brake cables are on the bottom. Whether or not his pinion angle is correct doesnt matter for this discussion. Adjusting pinion angle will not move the driveshaft side to side.
By chance is that a larger diameter driveshaft than stock?
