I have a problem with my ax15 in my YJ. It isnt wanting to shift into gear. It doesnt do this when it is cold. when it is cold, as soon as I push in the clutch, I can drop it into gear, but after it has warmed up, usally after driving around for 30 or so min it doesnt want to shift into gear. like if I pull up to a stop light, I usally take it out of gear while I wait, then the light will turn green and I will push in the clutch and it will not go into gear for nothing, pumping the clutch does nothing, as a matter of fact I put a brand new clutch and slave and master cylenders in it back at X-mas. letting out on the clutch and pushing it in agan does nothing, no matter how many times I do it. I usally have to set there and keep trying to push it into gear then stop, and push agan and agan, then finally push hard then it will go in, then everything is fine. But usally by the time I get it in gear the car next to me is 3-4 car lengths in front of my and the cars behind me are blowing their horns. It goes into gear just fine down shifting inot first when coming to a stop, I can take it out, leave the clutch pushed in and it will shift back in just fine, but if I let out on the clutch then I have to sit for a little bit before I gen get it to go into gear, so I am usally forced to just leave it in gear during long stop lights, I dont like doing that cause it will make the throwout bearing wear out quicker. somtimes I get mad and just push it into gear, but I am afraid I am gonn bend the shift fork or somthing. whats wrong with this thing. Oh yea, it does not grind when doing this.

Jeeps and Guns? My two favorite things!Sounds to me like a hydralic clutch issue to me since it changes with tempurature.I had a brand new clutch master cyl.from Autozone go bad after just 3 months.I don't think I would keep forcing it in gear as this will damage your syncros for sure. Hope you get it fixed.

try changing your tranny fluid to a synthetic. i dont know about yj's but i know that tj's have a nonserviceable external hydraulic slave cylinder. try a jeep junk yard see if they have one cheap. good time to step up to a 3550 eahhhhh

I just put in a new clutch, slave cylender (non serviceable internal--YJ) and a new master cylender back in december, so they souldnt be bad already? tranny fluid is not real old, dont see how synthetic could help it.

MMmmmm 3550...you gonna buy me one

you must of jinxed me cuz now my NEW clutch is messing up.. im getting a spinning chatter sound. so now i get to tear it all apart AGAIN and check out the throw out and pilot bearings again..... GRR

Jeepsandguns will it go into any other gear other than 1st then go into 1st. If so it sounds like your 1st gear syncro is bad. Can you shut the jeep off and get it into gear then restart it? again syncro.

nope, it wont go into any gear when it is doing it. havent tried shutting it off, it usally only does that when I am in the middle of traffic, and shutting it off when the light turns green probably aint a good idea around here...lol But one thing I have noticed is, if I am on enough of a slope or hill to where if I let off the brakes and let it roll forward, it will drop into gear a little easyer.

also another thing it does, when it is cold (like after sitting all night) when I go to drive it, it is real tough to shift into 2nd gear. and sometimes it even grinds, well mabey not really a grind, its kinda hard to describe, its like the gear is still spinning, but only slowly, so it dont really grind but more like you feel the teeth hit a little, but it only does that for a half a second, and only for the first half mile or so, then it does fine untill its warm and starts the not shifting into gear described above. I think the stiff shift into 2nd when cold might be the oil being cold and thick. But I am still stumed on the rest of it.

the cold comment, thats inherent.. you may be best off just getting a used ax15 from say www.car-parts.com its a pain in the butt to rig w/stuff when you can just swap it out.

mine is the other way doesn't like the cold but once warmed up all is good

that isnt the other way, thats the way we are talking about.... now mine is racheting for like a 1/2 mile then it just goes away.. only on a 1st drive of the day..... stupid jeeps i swear!

broken drain the fluid and replace with some good synthetic stuff, whatever your fav, redline etc.... might just be enough to help you out, if not my 3spd auto will be for sale in a few weeks, rebuilt less than 2000 miles ago

I think we all need better trannys, mabey we could get a package deal on some nv3550's...lol

Whats this new 6speed they are gonna put in the TJ's? whats the low down on it?

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I have a problem with my ax15 in my YJ. It isnt wanting to shift into gear. It doesnt do this when it is cold. when it is cold, as soon as I push in the clutch, I can drop it into gear, but after it has warmed up, usally after driving around for 30 or so min it doesnt want to shift into gear.

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OK I am dumb but not this time ....I think. He says it acts up when warmed up mine doesit when its cold. Or am I being me again.

nope i read the post the same way as you, i would think maybe the fluid is getting a little thin in it, or the slave cylinder is starting to go.

Yes you are correct, it does this when it is WARM. The slave and master are new, only about a year old. Last time I changed the oil in it (cant remember when it was) I got some of that lucas oil stabilizer (or somthing like that) cause it was shifting kinda rough (like the syncros were getting worn) it did fine un untill a few months ago. But as long as I dont take it out of gear I am fine.

I changed the oil in it tonight. I came home from a good 45min trip down the interstate, so the oil was nice and warm, and pulled the drain plug as soon as I pulled into the driveway. It was pretty dark and nasty looking. I filled it with fresh synthetic oil (valvoline synpower) I guess I will find out monday when I drive to work if it does any good.

Have I ever mentioned how mutch I HATE the smell of gear oil! NASTY!

Well, after driveing it all week, no real change. I have noticed that it does shift a little smoother since I put in the synthetic. But it still does the above mentioned "not going into gear" Tonight just for a peice of mind, I bled the clutch a couple times, still no change. I am stumped on this. What is it about being warm that makes it do this?

I'm guessing at this but here goes. Maybe guys with more knowlege than I can help you out. It may be the synchronizers. My thinking is that before you did anything (clutch, etc.) enverything had worn evenly and at the same rate. The synchronizers while not perfect worked because everything just fit with everything else, once you changed something the synchronizers began to show thier age and wear.

Just my guess

My 95 was doing the same thing a few months ago. It turned out to be air in the hydrolic line (Master cylinder was full). I drained it, refilled it, then bleed it. It works like a champ. I did not need to replace any hardware.
Good luck.

I have a 89 wrangler and swapped in a ax15, and have had the same shift problems that several of you have had. Once it warms up, it won't go into gear if you let the clutch out for nothin. When we did the swap, we put a new clutch and slave, and replaced the clutch lines with ss hoses. Does the snythetec oil work and what kind do you use, or does the flywheel resurfacing work? Is the new 6-speed availible yet and how much and will it bolt up to an 89 258?? HELP!!!