If you have to ask why and how, you probably shouldn't do it. Look around for a simpler way to improve your ride (shocks & springs.
You have two straight axles on leaf springs. This is WW2 technology with only a few upgrades. There isn't much you can do to improve the ride.
One thing to consider is as your Jeep stands now, there is a slip yoke that allows the axle to move up and down without destroying your driveshaft. With a spring reversal, the axle not only moves up & down, but fore & aft also.
Guys that build rock crawlers do a shackle reversal, not for a better ride, but for greater articulation. You will need some way to increase the length of your slip yoke.
Other forum members may want to chime in here if I have misstated anything.
Spring reversal changes all the front suspension geometry. The more lift, camber the leafs have, the more dramatic the changes. Before starting make sure you understand the design and how changes will affect everything including wheelbase and driveline length.
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