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thanks for the question,and let me just say this up front, I'm not an engineer by any stretch ----that said, I don't see any functional difference between this setup and what pick-ups have been running for years and years, the only difference is that my springs are mounted over the frame vs. under it like most trucks----heck, my 05 silverado 2500HD has the same basic set up in it. the front of the leafs are mounted in solid mounts and cannot move side to side or front to back at all, the rear spring mounts are solid to the frame and only have small "shackles" to allow the spring to arch and de-arch as needed. there is still no side-to-side movement in the rear of the springs, only front to back.Still, most modern semi-eliptical spring setups use either a sway bar mounted by brackets attached to the frame or by a panhard bar. It DOES help andling.the pinion angle will change slightly when changing speeds just do to spring "wind up", but when cruising it should be close to where its set at now. this too is no different than 99% of the full size trucks ever built.NOW--- if I was running control arms, then yes, I would need some sort of side-to-side control.not try to argue the point with you, and I appreciate the insights. it's always better to have a few sets of eyes looking at things because it's hard to cover everything.thanks,