Im planning on replacing my spark plug wires here soon. But, when it comes to u joints and ball joints and stuff like that, IMO, if it aint broke, dont fix it. Just keep em greased up and watch for the dust boots not to tear.
I mean, if you really wanted to, shocks could be nice to replace. You'd be surprised at the difference of ride quality after a new set of shocks. Transfercase and tranny fluid are some things that seem to be commonly overlooked. I dunno, the list could go on and on. JM2C.
"Jeep is America's only real sports car" - Enzo Ferarri