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Old 10-24-2009, 11:34 PM   #1
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1997 tj transmission will not shift when hot

I just purchased a TJ 97 with 136000 miles, when I tested it the transmission shifted great, I drove it home and the transmission would not go into any gear.
I was told I had had a bad pilot bearing, another mechanic told me it was a hydraulic problem, to change the clutch master and slave cylinder.
I changed the master and slave cylinder and I still have the problem, when I start the car it shifts perfect for the first 30 minutes or 20 miles, after that I wont go into any gear, I have to shot the engine off and get it in 1st gear to be able to go.
I noticed the transmission fluid is clean, could it be that the fluid was changed with the wrong grade oil? I went to a lube place to change the tranny’s oil and they did not carry 75w-90 as described in the manual. Would a heavier viscosity oil make the tranny not to shift when hot?
I’m trying every thing possible before I have to take the tranny down.
Can some one help?
Thanks.
CP

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Old 10-24-2009, 11:53 PM   #2
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If the gear oil was to thick it would be worse when cold,I would say you are getting air in the slave cylinder,Yes I know it is new but the slave cylinder on the wrangler is a little temper mental.Do not try to bleed it with the bleeder if yours is like most and is the plastic one.Pull the slave off and remove the cap on the master and by hand push the rod in and out 8-10 times and allow the air to work its way out the top at the master.

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Old 10-25-2009, 02:17 AM   #3
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Thanks a lot, I'm going to try that next, I will let you know as soon as I find out.
Thanks again.
CP
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Old 10-25-2009, 10:23 AM   #4
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I wonder if that would have anything to do with mine sticking IN gear... Also does it mostly when hot. Like if I am on the highway, it takes it a few miles of slow speed to loosen up again... Seems like it is almost always 2nd that does it tho, maybe something bad in my tranny...
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Old 10-25-2009, 11:57 AM   #5
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I would say on yours jwm if it is getting stuck in certain gears that your system either has a little air in it or the pressure plate is getting a little weak.Sometimes it will be hard to take out of second gear and kind of make a pop or a bang when it does come out,kind of like you don't have the pedal pushed all the way down?Is this the case???? If so I would say it is the pressure plate getting a little weak.
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Old 10-25-2009, 01:20 PM   #6
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No I never get any noise or grinding/popping when it happens.. It's just stuck, just have to push hard to get out of gear. Has fresh fluid in the tranny (Pennzoil Syncromesh)...
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Old 10-26-2009, 01:33 AM   #7
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I took the slave cylinder out, removed the cap from master and pumped it about 50 times, after that I drove it for 20 minutes and the same, I can't get it into gear after a full stop, if the jeep is rolling even at 1 mph, no problem it shifts great.
Any other sugestions before I take down the tranny and put in a clutch kit?
Thanks.
CP
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Old 10-26-2009, 10:35 AM   #8
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Quote:
Originally Posted by Muelero View Post
I took the slave cylinder out, removed the cap from master and pumped it about 50 times, after that I drove it for 20 minutes and the same, I can't get it into gear after a full stop, if the jeep is rolling even at 1 mph, no problem it shifts great.Any other sugestions before I take down the tranny and put in a clutch kit?
Thanks.
CP
Well with this being said, bleeding like crazy,new clutch kit,slave cylinder,etc I don't figure any of this is going to do any good.The problem now sounds more like internal problems the synchronizers in the tranny are the only thing allowing you to shift while moving.Sorry for putting you through extra work but you made it sound like it would just stop shifting after driving it for a while(and would not shift at all).
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Old 10-26-2009, 11:51 PM   #9
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Thanks for the info, I haven't put in the clutch kit yet, I just changed the master and slave cylinder but it keeps doing the same, I hear it could be the presure plate or the pilot bearing, and that's part of the clutch kit, i guess that will be my next projet.
Thanks again.
CP

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