rear disc conversion

There are at least 2 benefits to rear disc and that is rear lock up. By nature (or design) drum style pads transfer braking outward onto the drum as well as from one pad to the other.
Unless your disc/drum bias is perfect you can lock the rears and have the *** end come around on you. I guess you could add a proportioning valve to the rears.
A second benefit is weight savings. I run front and rear disc and while I have not noticed a huge difference in stopping power, the swap was cheap (puny Jeep GC with prop valve) and
no worries of rear lock-up. I drive like to drive it hard.

edit....I run 8.25 rear but you can go the Mopar Action route and use larger Jeep Patriot disc for OP's 8.75. Will take some minor machine work.