Soooo it's still leaking... What's the best way to find a leak?
Get up under the Jeep with a flashlight! Does it just leak when it's hot and you just got done driving it, or does it just sit there and leak all the time? And does it just drip very slowly or does it have a steady leak/drip for a while after you shut it off when you get done driving it?
Get it hot and drive it around and then immediately get out with a flashlight and some eye protection (if needed) and look up under there. Try to find where it's coming from. And pop the hood and see if you can see where it's escaping from above. The leak/drip is coming from somewhere, so the only way to find it is to follow the wet trail and figure out where it's coming out.
Don't use "stop-leak" products. It will just pollute your cooling system with metal flakes and won't work. You can correctly flush the system 10 or 20 times and STILL see those stupid aluminum or copper flakes floating around in your coolant.
By the way, I assume you correctly flushed your system after installing the new radiator and used the correct HOAT approved coolant and not the regular green or orange antifreeze? Also, after flushing with water several times (until all the old coolant was gone), did you refill with the entire radiator with pure, undiluted coolant? You should have gotten approximately the entire gallon of undiluted coolant in there. When you flush the system by running water through it and letting the engine warm up completely with the heater on for 10 minutes so that the ENTIRE cooling system - including the heater core, which holds half the coolant - is flushed, half of that water is still stuck in the heater core when you drain the radiator again. So when you get done flushing it like that several times, you don't want to finally refill the radiator with half water/half coolant because the system is already half full of water from all of the water that's still in the heater core and other plumbing. If you used a diluted mixture to refill the radiator, you'd actually end up with a 75 percent water/25 percent coolant mixture. As long as you got approximately one gallon of undiluted coolant in there (hopefully HOAT coolant, such as Mopar or Zerex G-05), you should be fine if the rest was just clean water (preferably distilled water).
Sorry if you know all of this, but I think it's probably a common mistake that people flush their system with water and then refill the radiator with 50/50 diluted coolant and end up with only 25 percent coolant in there, not realizing there was already about a gallon of water in the heater core (the whole system is about 2 gallons capacity - one gallon in the radiator and hoses, and the other in the heater core and other plumbing.
There IS a method of flushing that completely drains all 2 gallons after each flush, but you'd know if you used that method because it involves removing plugs on each side of the engine block that are a pain to get to (at least on the V8) and possibly removing the thermostat entirely during flushing.