Okay as title states i have i guess say i am having a problem where i only have intermittent lock up in my transmission of my 98 jeep cherokee 4x4 i have already changed my tps twice, my s3 solenoid, brake light switch on pedal arm, also put on tranny cooler, and nss. My problem persists of only having lock up for a certain amount of time say this morning i drove to work about 12 miles from home. For the first six miles i have lock up then i stop at a light take off from there no lockup for about four miles, where i make another stop at a stop sign. Take off from there i have lockup for the last two miles. Just about happens like this every morning. My question is what is going on? any advice would help im sure thanks let me know.

 

Also thought i might add that after i put the tranny cooler on and flushed the radiator. I went on a roughly 180 mile trip where my lock up worked perfectly. Just thought this info might help.

 

What do you mean by "lock up"?

 

X2.

 

Do you mean your tranny is racing and slips into gears before it's actually in gear

 

The AW4 has 4 forward gears and a lockup TC. My '96 Sport shifts to 4th (OD) at 40mph with light throttle and then the TC locks up at 45mph reducing the rpm by another 250-500. Its pretty obvious with the tach.

 

Which 4wd system do you have? I have a 2000 sport with Command Trac.

 

Exactly what this guy is saying is what i mean by lock up. I have an aw4.

 

Try draining and refilling the transfer case and trans mission. My '98 SE had the same problem: Intermittent lock-up. the problem went away when I changed the fluids.

 

Alright will try that this weekend and let all know whats going on. What kinda fluid do i put in the transfer case.? Tranny fluid or what?

 

Anybody?

 

transfer case gets same fluid as trans, Dexron III/Mercon

 

Alright so i changed the fluid in tranny and transfer case and it worked like a charm for a day then back to the same ole same ole. Shifted through all the gears then lockup perfectly. WTF i dont get it. I am totally confused. Anybody have any more suggestions? Comments? Questions?

 

Also another thing should i either go get a tranny flush being that i only drained the pan? Or should i start off with a used transmission?

 

I don't know what is going on, but it seems electronic. By draining and refilling, you've replaced about 1//2 of the fluid.

It would be interesting to see what voltage is going across the pin to S3 when lockup is occurring and when its not. That would be the wt/bk wire from the TCU to the S3, and it could be half-tapped at the TCU connector or at the 7 pin by the trans dipstick.

It could be the TCU. Have you ever unplugged the TCU and plugged it back in?