Installing subframe connectors

I got them at Summit. I just set the 2 back stands at the same height, as well as the fronts. My floor is level. You don't want the L&R sides at different heights. I bolted the front portion on, then marked the back part where it meets the car frame. I raised the car with the rearend, loading the leaf springs so it would be like it was sitting on the tires. It didn't change position at all, so I drilled the holes for the rear bolts, and put the sleeves in, bolted it together. Even with just the first one on, I wiggle the rear of the car, and it is MUCH stiffer than before, and that's only the side to side motion.