95-01 Explorer have disks, but the older ones are just as strong and the drums are still better than your Dana 35 brakes. The key is getting the right gear ratio. Nows the time to consider an upgrade if you have larger tires. 8.8s can be had in 3.55, 3.73 and 4.10.
car-part.com can help with your search for an axle. Oh, and it has to come from an Explorer/Mountineer, as any other 8.8 will either have the wrong wheel bolt pattern, be the wrong width, or be of inferior strength.
Check these sites for pointers on the 8.8 swap:
http://www.jedi.com/obiwan/jeep/ford88.html
http://xjfanatic.com/ford88.php
Oh, and XJ perches are farther apart than MJ perches, not the other way around.