How to tell if my springs are sagging

[wtm7.3]

I have a 2003 7.3 with 233,000 miles on it. I was just wondering how to tell if my springs are sagging, the reason being im about to get leveling kit and was wondering which route to go. Shackle lift, mini pack, add a leaf, or all new leaf spring lift. Any suggustions on lifts would be greatly appreciated. thanks Will

[timmyboy76]

not a fan of stacking blocks. Get axle wrap from it, then ur sol...sheared pins, blocks tweek..etc. I've read where people get the excusion code springs to help in leveling/better ride. But if not possible, i'd go the spring route...add-a-leaf will just band-aid bad springs and/or stiffer ride.