90' cherokee transmission slip?*help*

so i have a 1990 cherokee with 220k miles. i dont know if the previous owner had any kind of rebuilding to it but when i got this truck 2 years ago, i did the regular maintenance on it (changed the filter and new oil). now, when i get to about 4th gear (this is an auto not manual), i let go of the gas just slightly and it revs up on me. it just happens at about 30-35 MPH. it revs up like if its going on to Overdrive and then it comes back down like normal. i really cant afford to have this tranny rebuilt. any suggestions? i tried Lucas and it still has the problem. :banghead:

Doesn't necessarily sound like an internal transmission problem. Potentially the throttle position sensor? Also is the transmission "TV" cable linkage adjusted correctly at the throttle body?

well i know that for a fact its not the TPS becasue i just replaced it along with the oil change. now the cable, which one exactly is it?

Has it been doing this recently, because mine always does this when I barely open the throttle at 40 mph. As long as it doesn't slip at high engine loads, I wouldn't worry about it.

nestore said:

well i know that for a fact its not the TPS becasue i just replaced it along with the oil change. now the cable, which one exactly is it?

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Just checking but: you did adjust the TPS when you put it in right? I forgot to adjust mine when I put it in a while back.

nope no adjustment. its weird though because it just started to do this about 2 months ago. beforehand, there was no problem and it had the TPS that i had placed when i bought the jeep 2 years ago.

took it to the transmission shop and they said that the bands were worn out and that's the problem but dam, i dont trust shops. thats $1k we're talking about.

anyone?

nestore said:

anyone?

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first you need to adjust the tps with a voltmeter to factory specs. without the tps adjusted/set up proporly, its tough to diagnos the problem.


if it is the bands in the tranny, you would be better off replacing the trans with a junk yard replacement. i also believe the bands can be adjusted/tighened.

well i still have not had any time to adjust the TPS but now im noticing that the transmission or the whole car in general gets loose in N while im doing about 30-35 but then i put it into gear and it gets tight on me like if the transmission gets stiff.