Originally Posted by Timberwolf
there really is no cut-off point
some have gone over 300k miles without issue and still going
others have blown axles, trans or engine under 50k
rust is your biggest enemy, it is a time consuming PITA
everything else can be swapped in a long weekend
that being said, everything I have is over 175k miles and rusty
Good answer. Apart from structural rust, in theory your Jeep could go on forever with proper preventative maintenance, replacing/overhauling parts as necessary, etc.
I did a major overhaul of suspension, brake, and driveline parts at 96k on my TJ, and most of that work was technically preventative and done in advance of a multi-thousand mile adventure where we would be off-pavement and quite some distance from civilization.
I would also suggest you distinguish in your mind between "having problems" and "needing to perform maintenance" because, honestly, the latter is a natural part of ANY mechanical system's service life. If you replace parts before they fail, you won't ever "have problems" in the conventional sense of being broken down, stranded, etc. But that requires foresight, planning, and discipline - replacing 1 bad ball joint is easier than replacing all four AND the front axle u-joints AND brakes AND front wheel bearings, but why not zero-mile the whole system while you're at it? If you are willing to approach it from that perspective, you will have much better control over whether or not you "have problems" with your vehicle or not.