Power loss at 4000 rpm

cel means nana, scan it.

ok , as with all a/t
1: CHECK FUSEs.
2: Check levels, ATF
3: do the full flush and filter and pray magic. (i have no hope)
4: the more you slip it the more damage to those clutch packs.
diagnose slip, that is a big show stopper.
see thje on car tests for this A/T here.

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

check the coolant level see if its moving away from the tank if so you could be leaking coolant ....................... i ment seeif its going down away from mark onthe tank

u only did part of the job most people change the air intake first put in a cool box or k&n type which causes some of same problems as opening the exhaust-- ur letting to much air out no back pressure and not enough air going in causing an imbalance also ur going to have problems with o2 sensors/cat sensors also mass air flow down the line

Cruising rpm even after the OD has engaged has a lot to do with the differential gear ratio and tire size.
There will always be a variation between different vehichles due to that alone.
To see if the OD is working, at about 50mph, lightly touch the brake pedal. If the rpms increase for a moment then the OD was engaged. (touching the pedal momentarily disengages it...good thing to know when hill climbing!

It's quite possible to ruin a fuel pump by letting it run dry, especially if it already has years of use. When you first turn on the key, leave the door open and see if you can hear a high pitched whine for about three seconds. That would be the pump priming the system. If you don't hear it, then the pump isn't working. Be sure to turn the key of for about 10 seconds before you try listenng again(it has to reset). It can be hard to hear, especially over the key buzzer.

Your catylatic converter may be clogged if your loosing power or top speed is less than it was. You can check this when its running with a battery operated infared heat gauge. the temperature of the muffler should be around the same temp. as the catylatic converter.

Check condition of the tranny fluid it should be pink. Bring the jeep to a muffler place and have them check the cat convertor for blockage.

With normal acceleration the 1st to second shift point should be around 2500-3000 rpm. Most of your shifts under moderate acceleration will take place at this same point or when there a light load on the transmission. Under hard acceleration the RPMs will climp higher due to increased power needs and the computer will shift when less power is needed or the RPMs climb to an unsafe speed say5000-6000rpms (depending on where yours redlines). Also going up a steep hill will raise the RPMs higher and goind down a hill will cause a faster shift at lower RPMs. These can always be altered by an individual owner by adjusting shift points, using performance parts and if you have problems (low tranny fluid/trans issues). Your trans RPMS are fine and will vary depening on how your foot accelerates. The shift pattern should be the same every time you drive slow/medium/fast/, look for changes in those patterns you will also catch a problem early.

this is normal for the transmisson to down shift out of over drive it does this because your engine is running out of power on the up grade. now you shouldnt be alarmed unless it slips out of overdrive on a flat road

knock sensor needs replace