95-01 8.8s are all the same. even v6 and v8 ones are the same inside, just with different brackets on the outside.
I would plan on wheel spacers, not necessarily because the 8.8 is a hair more narrow than a Dana 35 (5/8"), but because the bed of an MJ is wider than the front of a comanche and it will pull the tires out from under the rear fenders and make it look normal. do not go cheap on wheel spacers. get only the best. :thumbsup:
you can also try to find a cherokee 8.25 rear axle with 4.10s and then convert it to disks using various methods.
find a Dana 30 with 4.10 gears. :thumbsup:
car-part.com can help with scouring junkyards