no i havent tubbed it, i just budded the leaf spring up against the frame rail and drilled new holes for the mounts, it gave an extra 3/4" on both sides which i used every fraction of that. its only a redstripe 255 in the rear but i mounted it on a 10" rim to widen it out and give it better handling, also makes it look wider than it really is. its a cheater trick we used it short track racing, use a 1" wider rim than the tire is for and we dropped our times nearly a half second. the sway bar setup is intended for nascar division racing but i bent the torsion bar creating a sump in the center for the crank pulley and then had the arms ceramic chromed. i made mounts using the bumper mount bolts so i didnt drill any holes in the unibody.