Been running the out of the box spring rates. 1.5 inch of preload up front, .75 in the rear. Im guessing my rig is a little heavy? Front bumper w/winch, rear shorty bumper, rear corner armor, rocker armor and sliders, trail cage, tuffy box. Not running heavy fenders though. Everything is really level, rides ok. Don't haul really anything. For the life of me, no matter what I do, I can not keep the front coils from smacking the hell out of the timing ring. The springs I guess bow just slightly to make contact. You think running a lower 300 coil up front might help?
Your coil is supposed to hit the timing ring, that's what they're for, they allow your secondary spring to engage. Or, by "smacking", do you mean the coil is "catching" the timing ring and making a sound?