Check your timing 7 to 10 degrees before top dead center ( if I remember correct). Then if it is close to octane knock that can cause you to run hotter then need be. It will start good and run like a raped ape.
2 or 4 barrel carb ,too big or too small can cause what you describe. You might be running to lean. This easy to see look at your exhaust pipes black is normal but not with a build up( smooth looking) tanish to white would be too lean (this is great for fuel mileage) but not for keeping the engine in normal heat range.
if all the above is good then you might want to add an engine oil cooler to your jeep. They are good for a 10-20* lower temps.
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Originally Posted by bigsquat
im just cheap, and cheap makes you creative.