I have an 84 FJ60....rust free....mostly original except for suspension, tires and center console.....i love it. runs great, handles the trails great, has character that a new jeep wont have. That being said....it rides rough, there is always something to tinker with especially if previous owner was an idiot...but they are awesome rigs. Kind of like a stripper....high maintenance and sometimes a pain in the ass....but when you are driving her hard this not anything else like it.
Here is mine..picture taken a month or two ago
Leaking birfs....nonsense....all leak and a knuckle rebuild fixes it as it is just a worn inner seal causing the problems...normal wear and tear. If done right will last you 60-100k miles...easily. Mine was done for first time at 200k this year.
pros- solid, workhorse, very strong diffs and axles, torgue monster motor, motors are nearly indestructable (2F) classic styling and likely one of the most loved expedition rigs in the world...
cons-gas mileage, low horsepower, 70mph about top cruising speed, 2F smog crap with vacuum lines and emissions valves...big pain in ass but can be desmogged most places.
Expedition and trail mix with daily driving....FJ60
Trail rig only and maneuverability...and modern comforts...new Jeep.