Welcome to Jeepz...
The wrangler TJ 97-05 came into production in the latter part of 96 and sold as a 97. Jeep didn't officially have a 96 but some TJ's were produced in 96. The main change over from the YJ was going to a coil spring suspension and the introduction of 4.0L.
97 to early 2000 still came with a distributor type of ignition.
At this point since you don't know the jeeps whole history your best bet is change all the fluids, including your radiator fluid, transmission,
transfer case, power steering fluid, and both axles. I would recommend that you go full synthetic then stick with it since its an older TJ.
Your main belt should have been changed at 50K but don't bet on it and change it, keeping the old one as a spare...I know what the dry summer heat does to it down in AZ.
Visually check your rubber boots on all of your steering knuckles and have them greased as part of your new maintenance schedule.
Your battery should be looked at to see how it held up, summer is coming and it tests any liquid acid core battery down there.
BTW nice pic... Flagstaff perhaps? I grew up in the Tempe/Chandler area till I moved to Utah in 2000.
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The tricky part is not being able to drive it in....but being able to drive it out.
2001 TJ 4" of lift, long arm kit,ARB's F/R with a viair 450c. Custom front bumper,rocker panels, and sliders.
Only 220 miles to Moab
Only 1622 miles to Red's fridge full of (non-utahian) beer