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I wouldn't personally do the chains if it was me.
A big thing that I would make sure, would be to look for a metal impeller water pump, I thought I remember there being a company that was making one for the WJ. I would also definitely change the thermostat and while it is all apart, flush the system.
99' WJ, 2.5" Rusty's, Bilstein 5100's, JKS TrackBar, Moog SuperTrailBoss
"With enough fabbing, time & $, it's certainly possible.
That being said, it's like boinkin' your sister...just because you can, doesn't mean you should." - Double E