congrats on the new purchase. i have a 99 with 105k. i have replace all fluids many times.
THings i have replaced.
oil pressure sender
rear output shaft seal (leak)
transfer case grommet on top of case. (leak)
As far as basic mods. Maybe the rear addco sway bar to help reduce the "body roll" on turns.
2010 JK Wrangler Unlimited Sahara
2001 XJ Cherokee Limited
1999 WJ Grand Cherokee Limited