Ok, I'm new here so go easy. I'm redoing the front suspension setup on my 1940 Chevy pickup. I've got new tube axle, spring,shackles,brakes,whatever. I'm looking at radius rods. I know I have to mock it all up with weight and tires on to properly set caster before I weld hairpin mount to frame. Maybe a stupid question, but when I lower off the jack stands how I keep from pivoting on the shackle mounts?