Question about 1989 Jeep Cherokee

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Transmission shifts late 89 jeep cherokee 4.0l Auto

Was working fine then the other day it wouldnt shift untill the engine reached 4500 rpms. doesnt slip or overheat. changed fluid and filter pan was clean and fluid looked good tried adjusting kickdown cable with no results. Actually un hooked the kickdown and drove it, It still shifted late and would still downshift when I stepped on accelarater. This makes no sense to me. any suggestions would be apreciated

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  • jjdnsfekf Mar 04, 2009

    Well there is no vacuum to it but the converter clutch circut may be something to it. It is a AW4 trans. thanks

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I have 1989 jeep cherokee auto wjen put in drive it starts out in 4th gear and goes slow until it builds up speed

Posted on Oct 13, 2010

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Discovered a service bulletin on my Jeep on "Alldata.com", which indicated "A/T - Throttle Position Sensor".I don't subscribe to the site, so I could only see this header. I thendid a search on Throttle Position Sensor and found a number of sitesthat described numerous transmission problems attributed to this sensor.I tookthe Jeep to a Chrysler dealer near me, and purchased the part for$69.00. I installed it myself, and the Jeep shifts beautifully, betterthan when I bought it.

A. The TSB you are refering to is number ATRATB324A, dated 1/1/1996 witrh the subject "A/T - AW4 Throttle Position Sensor (TP)".
TheTransmission Control Unit does, indeed, use an input, among others,from the TPS to determine shift times. So if there is a problem withthe TPS, it will effect transmission shifting. In fact, it is not allthat uncommon to see a TPS cause a transmission problem.


If the transmission works fine after the TPS is replaced then I would only recommend thata routine flush be done to it and perhaps treat it to a new filter.

http://autorepair.about.com/library/faqs/bl070g.htm

Posted on May 30, 2009

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Is there a vaccum hose on the tranny or is there a missing hose where there should be one?
Honestly, I am almost positive it is your torque converter clutch circuit. This is the shifting mechanism for automatic trannys

Posted on Mar 04, 2009

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Rpms runnning over 2000 jeep cherokee laredo 1997


Maybe the Throttle Position Sensor (TPS) if the computer thinks it is all the way to the floor then the gears would not shift until the engine RPM is real high. Also would not be able to determine the car is supposed to be idling. Do you have a check engine light? If you do this may come up on a scanner.

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Transmission will never hold the engine back if it is going through the gears properly.If it gets into high gear, eventually the engine will reach "redline" if you stay into it long enough. ("redline" for any engine is the point at which it cannot run any faster without harming itself.) DO NOT confuse that with proper shift points which should happen just before you reach max torque which happens way before you reach "redline" at which point you are way past the torque peak of the engine, and making no usable torque or horsepower. An example of this is a race engine with a max rpm limit of 10,000rpm.("redline") Depending upon the torque curve (determined by compression, stroke and type of cam grind) you would likely be shifting gears at about 7500 to 8500RPM not at 10,000.
Therefore, your shift points are like climbing a ladder. you get just so high and though there are more steps, you will fall off if you go there. Each time you shift, you are putting the rpms back into the usable power band, till you reach the next step, then start over again. If your trans shifts early the engine will lug and labor. shifting too late and it will quickly reach "redline" and self destruct or go "flat". In a conversion, you need to make sure that the electronics that control shift points are working within the usable torque range.
OR install a manual valve body and shifter and control it like a stick shift car, using your brain as the computer and a tach to tell you where you are.

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My 96 Jeep has trouble shifting from 2nd to 3rd gear.The rpms go up to 4500 then it shifts.


That sounds like the 1st thing to check is the transmission fluid.Start the car ,warm it up,now shift through all the gears and stop in (N).With the engine running,check the fluid level.Top up if needed.If you do,look for leaks.Hope this helps

Feb 02, 2010 | 1996 Jeep Grand Cherokee

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1989 jeep cherokee 6cly auto trans shifts great after gets hot 10-15 min. but when cold shift very high 4500 rpms 1st-2nd and wont shift to 3rd almost like stuck in passing gear. when hot shifts great no...


Sometimes you tranny may just be low in which case add fluid. Be sure to check while engine is hot, most likely in park or nuetral. It will say on dipstick. Also if you havent changed the filter you may want to do that, sometimes crud gets built up and it will not circulate well unless hot. If you change the filter, be careful as usually there is not a drain plug and the only way is to drop the pan. If you do go that route I advise buying a drain plug and drill a hole in pan and replace with plug so in the future theres less mess and a whole lot easier job. Hope this helps. Be sure to read directions on drilling hole for plug and be sure its drilled somewhere on the pan that doesnt get in the way of anything underneath.

Oct 11, 2009 | 1989 Jeep Cherokee

1 Answer

1994 JEEP GRAND CHEROKEE-TRANSMISSION "SLIPS" ON TAKE OFF.


First of all make sure you are checking the fluid right. Some people do not know that in order to check transmission fluid the engine needs to be running and the temperature needs to be sort of warm althought you should be able to get a good Idea just by the engine running. In this instance you might have a governer valve that isn't properly working to shift the engine when hydraulic pressure reaches a certain PSI. I would suggest having it flushed and put in new fluid and filter. If this doesn't work the problem is more serious and might need some professional assistance.

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