I am at 143k on a 13 grand cherokee with the 3.6, I have been pretty lucky, minimal repair, mostly just wear and tear.
Jeeps are not known for reliability or build quality, off road wise that thing will go where you need and beyond, to the point you would damage something before running out of it's capability, I mean cosmetic damage.
My grand is o wrangler but it has been through some things that did not look like a good idea with minimal issue, smashed up the lower fascia and wheel well liners and such, but not much mechanical damage, did crush a mount where the axle nut attaches if I remember correctly, had to get a new axle end, mount and nut, crushed it on some rocks. Had no idea until I was in for a recall.
