I have an 83' pickup. and want to reverse and put the rear leaf springs on the front. I've done this before to an 84' and it was great, soft ride and great down travel. however the up travel was limited due to the front shackel maxing out against the frame. I don't know if I should move the shackle mount back (which would be kind of hard because the frame curves inward) or lowering the leaf perch (by adding squair tubing between the pirches and the frame). Should I do bowth modifications or will only one of them work? Also specs and measurements will be greatly appreaciated.