Congratulations on keeping your Jeep so long and keeping it and yourself happy!
Sounds to me like you have a good handle on the mechanical stuff. How about the other 'Jeep Killers'?
Frame rust - there are literally dozens on threads on here about how to detect, treat, prevent, and correct frame rust.
Fan motor - they were not that great when new, but they get old and the varnish insulation inside the motor starts to crack with age and cause little short circuits. These cause the current required to turn the motor to increase and, eventually, the fan motor voltage divider resistors fail. Probably better to replace the motor when you want to instead of when you have to.
Headlights - LED lights are much brighter, yet use less power than the originals. It's kind of strange to drive a Jeep and actually be able to see at night.
Brake hoses - as has been reported by many, the hoses can break down internally and start acting like veins; that is, they allow the fluid to flow only in one direction. The fix is to replace them.
Fluids - you mention them, but no specifics. I assume you have changed your coolant, but how about brake fluid, power steering fluid, transmission and transfer case?
Rubber - you mentioned the fan belt, but you might also consider the heater hoses and radiator hoses.
Every time I do something preventative to my LJR, and herself asks about the cost, I just take her up to the Jeep dealership on the corner to look at the new Jeeps. They are huge on the inside, very wide on the outside, contain a lot more plastic and electronics; but the biggest deal is the price. They all offer seven year financing plans, because normal people can't afford the monthly hit on a six year plan. Open the hood and prepare for a plastic overdose. I bought my latest LJR (2006) nine years ago for under $15k. I just spent almost $3k getting the entire front end and all of the fluids replaced or repaired. A new Jeep Wrangler (not the 392) is advertised at $65,875. Her usual response is, "Who would pay that much for this cr*p?" According to the sales agent, not hardly anyone. They had 116 Jeeps on the lot, eight of them were Gladiators, eight were electric Wranglers, and eight were Wranglers; and of them three were 392s, at $85k (yes, for a Jeep). I'm with you — I intend you keep my Jeep forever and let my kids fight over who gets it after I'm gone.
