on a car lift not just a jack, and what exactly is it?
If you mean the seam along the side of the body, where the rocker sills are attached, I wouldn't if you have an alternative, like a spring pad or crossmember. Anytime you put stress on this area, you weaken it. Older model K cars and Chrysler products had the car jack use this area as a lift point. I've seen lots of cars ruined, when rust damage allowed the lift to go through the area, then damage the door or something worse. It's just an exposed seam spot welded together at the factory. Hope this helped
