It could be a lubrication problem, changed the oil recently?
If it is a lifter you should hear it louder by listening at the oil filler hole, see my previous post.
An exhaust leak - headpipe, manifold etc - a small leak can expand and contract depending on the temperature, changing the noise you hear.
You said: """""it ticks when I take off from a dead stop and then eventually stop at a higher RPM.."""""
When accelerating the volume of exhaust is greater - with greater pressure, so an exhaust leak gets louder. Decelerating it usually gets quieter.
A decent way to look for it -
Dark garage or at night. Use a strong pencil beam flashlight underneath to look while someone sprays carb cleaner, Sea Foam, WD-40 or down the throat to make it smoke. Do it under the conditions where the noise is the loudest, hot, cold etc.
The pencil beam will pinpoint where it's coming out. A wide beam or droplight won't show it as well.
TJ's are famous for cracks in the exhaust manifold. Do a search on here to verify it.
Replacing the lifters will cure it too - when you take it all apart then reassemble you will have replaced or tightened wherever it was leaking too. It's just lots more work!
The ticking noise may also be "up top." If you can't find an exhaust leak and you hear it better through the oil filler hole - remove the valve cover. Check the rockers and pushrods, you may get lucky with something awry there. (Much less work.)
Let us know what you find.