What is a lifespan of the 4.0, I would guess with regular maintenance 200k or more but i have no idea ?
18 yrs old and 150k isn't excessive, resale later may take a hit on that though but depends what your plan is with a TJ ? Just asking because i have been down the 100/150k mileage thing before and it always has been an impact on my resale. Just something to consider if you think you may ever trade off for a mini van (JK) due to a larger family or something- you know life happens lol
The tires on the rear have different wear pattern, maybe one wheel smokey burnouts (could be the camera angle too) ?