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The lifters in your 4.0 are automatically self adjusting to 0 lash. The rockers aren't adjustable, when they are installed they bolt down solid to 21 ft lbs, no adjustment possible or required.
If you have lifter tick on startup make sure the oil filter you are using has a drainback valve. Many aftermarket filters don't, and it allows the oil to drain back down into the pan while the engine is off. This will cause some lifter noise on startup until the oil reaches the top end.
Also if you are running thick oil you may have some lifter noise on startup in cold weather because the oil travels so slowly. 10w30 or 5w30 are recommended.
If the oil and filter are ok and you have lifter noise when cold then you may have one or more lifters that need to be replaced.
I would definitely try another brand of oil filter other than the one you have on it (it's a big offender of problems). Your best bet would be a Mopar filter from your dealer, it runs about $5.
Replacing the lifters in a 4.0 will take about 5-6 hours. The lifters are under the cylinder head and it has to come off to get them out of the block.
Thanks for your help but $23 seems like alot for this answer
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no cold air blowing out when ac is on but low pressure