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Topic Review (Newest First)
09-03-2013 09:06 AM
Marinemail05 So I have a 99 with AX-15 that has all the same problems. When I come to a stop i can't get it to go into 1st. so I would always go into another gear and then into 1st and that was working. Now from a complete stop I'm having trouble getting into any gear. I replaced the master/slave cylinder and that did not help. The problem only happens once everything is warmed up. When I first take off driving it seems fine. I'm leaning towards the clutch now. I was told that it could be the springs in the clutch or the throwout bearing..... I'm not sure. Once I'm moving everything shifts fine so I'm hoping that means the transmission itself is OK.....
05-19-2013 05:28 AM
KentuckyMike My 94' 4.0 AX15 was shifting fine when I purchased it in February this year, then changed all the fluids and after changing the transmission oil to typical 85w90 gear oil, it started getting harder to put into gear. Especially during cold 1st - 2nd shift change. After it warms up, shifts fine. Going to change to Synchromesh next time, to see if there is any change with the cold shifts.

If there is still no change, I am going to replace the slave cylinder, as it feels to me that it may not be disengaging the clutch completely, when depressing the clutch pedal. Which would cause hard shifts, or make it hard to get into gear from neutral when stopped.
05-18-2013 03:56 AM
Dac7529 I did a lot of research on a similar problem went through trial and error as well. Mine would not shift into 2nd. Long story I changed the fluid problem solved but only for about a week. So then I used synchromesh which I've read conflicting results on it same thing though it was a short term fix. In the end I found out that our trannys run best off of 10w30 and is actually what is recommended. I laughed at first but if you go to the dealership and tell them you wanna buy some transmission fluid your gonna get 10w30 its what they use. And it worked for me. I got ax 5. Not sure bout ax15
05-17-2013 11:17 AM
Old LT This is just the thread I was looking for! My 91, 4.0 AX15 was working just fine other than the stiffness going into first gear sometimes from a stop. A couple weeks ago, I had to commute about for a few days on the interstate at about 85 miles each way. Toward the end, I found that downshifting caused grinding briefly. I also noted that when I back down my driveway (slight slope) and push in the clutch in reverse, I feel a type of grinding through the shifter. I changed the transfer case oil last night and will hit the trans oil this evening. There is great advice on steps to take already given. Anything else before I consider dropping the transmission?

Thank you.
05-16-2013 01:35 PM
Jeep_Monkey Last year, while driving my 94 YJ, 2.5L 5-speed manual around the western half of the country, I started noticing that it was stiffer than usual going into first gear... and from first to second sometimes. This was a slow progression so I am sure it didn't just all the sudden feel like this. So as I continued my trip, I started paying more attention to it.

A few hundred miles later, I had a situation where even with a lot of effort, I could not get it into first gear while stopped. So like you, I just started making sure it was in first gear as I coasted to a stop.

As you might expect, bad situations don't heal themselves. A day or so later (driving about 400 miles a day), I had similar problem with reverse... all it would do is grind like I wasn't even using the clutch. So now it was time to look for help.

I happened to be in Moab, UT. All of us have probably heard horror stories about having to get repairs done when you are out of town. I showed up at Arches Repair Center at 7:00 when they opened. They were able to begin work on my jeep right away. A little while later, they called me back to the shop to show me my problem.

In my case, the slave cylinder (94 is outside the transmission case compared to earlier models) had to be replaced. The connector to the line from the master cylinder was damaged, not letting fluid flow like it should into the slave cylinder. I elected to have them replace both the master and slave cylinders at the same time. Overall, the cost including parts was around $300 or so. Not bad considering typical prices for shop labor.

That was in September of last year. I have not done anything other than check fluid level since and transmission shifts like a new one.
05-12-2013 06:13 AM
philiproots wakeboard 236 - swapped out the old oil with the Pennzoil synchro - it is smoother now but the problem hasn't totally gone away. My clutch fluid was a little low too but topping it up really didn't make any difference. I will live with it for now - am getting use to making sure it's in first gear before I come to a complete stop. Hope yours is an easy fix.
madecant - no grinding between gears. only grinds when going into reverse but not always.
05-11-2013 08:07 AM
madecant Just curious, wouldn’t he be getting some kind of grinding between gears (up or down shifting) if it is the synchros. instead of just at a complete stop.
05-10-2013 11:36 PM
wakeboard236 Just stumbled across this thread and literally have every symptom you were experiencing. Were you successful at fixing the problem?
05-01-2013 06:41 AM
KentuckyMike
Quote:
Originally Posted by philiproots View Post
So I contacted Redline directly and this was their response:

"Thank you for contacting Red Line Oil, in your Jeep transmission the 75W90NS would be recommended to match the viscosity and type fluid called for. The MTL and MT-90 are both GL-4 gear oils rather than a GL-5 as specified.
Do you know what fluid is currently installed? It may be too slippery for the synchros."

So I'm going with the other recommendation which was Pennzoil Sychromesh - it's cheaper and readily available at Advance and Autozone.

Thanks for posting. Good info to know.
04-30-2013 08:53 AM
JD95YJ I use the synchromesh too.
04-30-2013 05:19 AM
philiproots So I contacted Redline directly and this was their response:

"Thank you for contacting Red Line Oil, in your Jeep transmission the 75W90NS would be recommended to match the viscosity and type fluid called for. The MTL and MT-90 are both GL-4 gear oils rather than a GL-5 as specified.
Do you know what fluid is currently installed? It may be too slippery for the synchros."

So I'm going with the other recommendation which was Pennzoil Sychromesh - it's cheaper and readily available at Advance and Autozone.


04-29-2013 01:58 PM
KentuckyMike ahh ok. .. thanks AV8R, much appreciated.
04-27-2013 07:57 AM
philiproots OK - local auto stores here in SE VA don't sell Redline MT-90 so I am going to order it from Amazon but there's more than one type and weight. I am a weekend driver living in a pretty warm climate - any suggestions as to which type and weight I should order?
04-18-2013 11:07 AM
AV8R KentuckyMike,

I use Pennzoil Sychromesh in the yellow bottles.

Synchromesh manual transmission fluid
04-18-2013 08:53 AM
KentuckyMike
Quote:
Originally Posted by AV8R View Post
Drain your tranny and see if you've struck gold! I mean, brass... Your synchros may be toast, especially if you're running a GL5 gear oil in there.

I drained mine (PO had GL5 gear oil in there) and refilled with synchromesh. It has been shifting like butter ever since.
When you stated you refilled with Synchromesh fluid, do you mean reg. gear 85w90 gear oil ? I just recently purchased my 94 YJ( my first Jeep that isnt a CJ7) and the AX15 called for the 85w90 gear oil, the same as the axles. Just curious and want to make sure I didn't get some bad information about the proper fluids. My 2002 Blazer 389 C.I. street rod has a factory 5 speed too and it calls for a special GM trans fluid that has to be purchased through a dealer. Thanks !
04-18-2013 08:34 AM
ChaddG another possibility could be the throw out bearing tucked inside the engine, this happened in my ford escort, the trans had to be split from the engine and the bearing replaced.
04-18-2013 08:32 AM
philiproots Very good - thanks for the great advice!
04-16-2013 04:54 PM
NonRubicon Sounds like what happened with my brother's 2003 Ranger. Shifted like normal until the transmission warmed up enough - then it wouldn't shift from neutral into first from a stop but as long as you were rolling it would shift just fine. Had to keep it in first gear at stops, while holding down the clutch. In that case it turned out it the clutch plate assembly was toast.

Things to try:
  • Bleed the clutch, replace all the old fluid with fresh stuff. Old clutch fluid can cause problems.
  • Change the transmission oil. As mentioned be on the lookout for large chunks of brass. Small flakes are to be expected, but large chunks are not good.

If either flushing/bleeding the clutch and changing the trans oil don't help, you might be in need of a new clutch, or you might have transmission problems. At that point though it could be a crap shoot as to which one you have. I would lean towards the clutch based on my experience with my brothers Ranger.
04-15-2013 10:38 AM
philiproots I like that idea better - hopefully it's not too late to save the synchros! Thank you.
04-15-2013 09:31 AM
AV8R Drain your tranny and see if you've struck gold! I mean, brass... Your synchros may be toast, especially if you're running a GL5 gear oil in there.

I drained mine (PO had GL5 gear oil in there) and refilled with synchromesh. It has been shifting like butter ever since.
04-15-2013 07:58 AM
philiproots Don't know much about transmissions but that sounds expensive. Just don't understand why it only happens when I am stopped and only after the transmission has warmed up. I think you might be right though - the transmission makes a heck of a racket except for when I'm in fourth gear.

Will check my clutch fluid level first - thanks for the advice!
04-15-2013 07:51 AM
sevenservices sounds like your clutch is not disengaging all the way. Its one of two things,

either the clutch is not releasing enough allowing the engine to fully disengage. In this case, might be time for a new clutch. But first, make sure your full on clutch fluid.

second, if your clutch is working great and it still does not want to pop into gear then your syncronizer gears could be going to the way side.
04-15-2013 07:45 AM
philiproots
trouble shifting when stopped

'93 4-cyl, 5 spd: no trouble shifting when cold but when it's warmed up I have a heck of a time shifting into any gear when at a standstill/stopped - no trouble down-shifting or upshifting when moving though. I have to really force it into gear but it feels like I'm overcoming something rubbery and plastic, not hard and metallic (if that makes sense). Also grinds into reverse when warm, at standstill and I'm having this same shifting problem - otherwise it goes into reverse smoothly. Any clues/suggestions?

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