What's your ultimate goal here? A lot of focus seems to be on the rear brakes with this post and another. Due to weight transfer, the rear brakes don't do a whole lot.
Just put on a set of rear disc brakes from a 2nd gen Explorer. Same axle. Same bolt pattern. My '97 has rear discs.
I think the rears are solid instead of vented, but due to weight transfer, the rears don't get that hot unless you're dragging a caliper.
Why so much focus on the rear?
Hetzer, are you in the Ukraine? And for clarity, is your vehicle a 91 Explorer, but with a rear axle from a 98?
your back brakes don't do enough to warrant way better stopping abilities from them anyways,
as suggested front brake upgrades are the most bang for the bucks,, vented or cross drilled rotors and upgraded pads there do the most good as the weight is more on the front and the back will just slide and kick out anyways,,
i'm not guessing here either,, i drive in snow for 6 months of the year, that will show you in a real big hurry the inadequacies of any braking or drive system,,
go into an empty parking lot with lots of room to experiment,,
drive across the lot, as you get up to a decent speed reach down put your right foot on the brake pedal , and your left on the e-brake pedal, and push lightly,, it's scare you pretty good,as you go swirling all over the place,,
experiment done,, point proven,,
adding more rear brakes is not good,,
I would have to say, stay away from drilled and slotted rotors.
They remove thermal mass needed to decelerate the tires. The tires are what stop the truck.
Drilled holes propagate cracks as well as over heat. Slots act as a scraper, wearing out the pads faster.