AX15 transmission

Your 2.5L indicates your transmission is an AX-5. The AX-15 is only used with the 4.0L six-cylinder engine. Synchronizers are the most likely problem with your transmission, they go out far more frequently with wear than just about anything else in a trannie. I'd be looking at just them, with maybe a question of how much more for a complete overhaul if you plan to keep your '93.

Jerry

fabian snipped-for-privacy@yahoo.ca wrote:

Both Chilton and the Quadratec catalog seem to indicate a AX-15 with the AX-5 being models earlier to 91. Bill had some good comments. However, I had the master cylinder and slave replaced sometime back. Drat... that was the internal version too! Actually, over pumping the clutch to compensate for a slave cylinder on its last legs cost me that master cylinder, so I was told.

The problem is consistent with 2-3 shifts. It is a seriously blocked shift. Rev'ing between gears does not help. I also have a transmission whine and grind that I will partially right off to a disintegrating transmission mount.

Geez... a professional rebuild may cost me a fortune. With the price of vehicules these days, I might need to get burying in 'ye old YJ. Thanks!

Fabe

The '94 year model four cylinder manual sported an external slave cylinder clutch housing upgrade. Since you are going to have to replace the transmission one way or another, I would look into upgrading the clutch housing and slave unit to the new design at the same time. Perhaps you can find everything you need at a recycling yard. I have a '95 with the 2.5 liter engine and AX-5 transmission. It is going on eighty thousand miles with no problem, except for some reluctance to down shift into second in cold weather.

I had a '61 Volvo with similar symptoms to your Jeep. It turns out that a previous owner had assembled the transmission incorrectly! A "seriously blocked shift" and whining sounds like something broken. Whining is usually a bad gear, bearing or both, and the cost of parts to rebuild the transmission will probably make you cry. These transmissions require special tools and precise clearances to be rebuilt properly, and in my opinion a professional rebuild is likely to be cheaper, in the long run, than an amateur attempt.

Earle

Just for grins, call or email the guys at SoonerJeep.com - addresses are on that website, AIR. While they have a reputatation of being a bit proud of their stuff, I found them to be pretty reasonable. You may be able to get a rebuilt tranny cheaper than having yours rebuilt locally - I know the AX15 I bought from them was cheaper than any rebuild estimates I've seen, even with shipping charges added in. The shipping will probably tip the balance on the cost. I was replacing a BA10/5 so I didn't even have a core.

Personal opinion, but I had a good experience with them. Good support and followup with folks that seemed to know what they were doing (and specializing in Jeeps).

I am converted (so to speak) in that I believe all are right in that I have an AX-5. Yes, the following year brought the slave cylinder outside. Hmmm... this job only sensibly ends up in a new pressure plate and clutch disk. Gee... "fun" were the days when hoisting my standard into my 86 Mustang let it fall in my face. You little &%$# !!!! was all that was needed to go into Hercules mode to mate that beast into place.

I would like to know what special tools are? I can borrow a digital caliper, that I am sure. There is a machine shop at the end of the street for an odd disassembly and a close college is a mechanical eng, making any attempts by this 'sparkie' not totally prone to my final destiny of buying a horse.

I will attempt the unthinkable and try to sweet talk the dealer into a full set of torque/clearance specs. My father knows the dealers parts man. The 'theory of relativity' (who you know) makes normal/amateur jobs less begine.

Another a silly question, could a shifting fork have been damaged by over compensating (or feeling in gear) for the problem I am describing? This problem "comes and goes".

Fabe

Mechanics and physicians hate problems that come and go. One thing to try is to replace the fluid with high quality synthetic manual transmission fluid of the proper weight. That is API/GL5 75W90. This looks like a good bet

Iused the Mobil 1 offering from Checkers in my YJ, and it did all right. When I was younger I was told that all you need in addition to ordinary mechanic's tools is "good snap ring pliers and a brass drift". The service manual from Jeep/Mopar will have all the special tools, clearances, and specs. The source for the special tools is Miller Special Tools. Your Jeep dealer will have their phone number. Many special tools can be made or approximated with materials at hand, but some are impossible. If you get the Miller Special Tools catalog, take a look at the kit for setting up Dana axles. It is real slick and chances are you will need or want it in the future.

A mechanical engineer is not the same as a technician who has rebuilt several manual transmissions already. If there is really a transmission problem, that is who you will need.

Earle "Mi vida...es un merengue." Olga Tañón

Earl, GL-5 is exactly what you don't want to run in the AX-5 or AX-15. Jeep dropped the GL-5 recommendation several years ago and now specifies GL-3, though GL-4 is ok too. Most GL-5 gear lubes have sulphur-based additves that are harmful to the soft yellow metals used to make the gear synchronizers. GL-5 is mainly meant for the hypoid cut gears used in the differentials.

Jerry

Earle Hort> Mechanics and physicians hate problems that come and go. One thing to try

I wonder if this applies to synthetics? When I shop for a high quality synthetic MT fluid, everything I come up with is GL-5.

Earle

I> > used the Mobil 1 offering from Checkers in my YJ, and it did all right.> >

It doesn't have to do with how good the gear lube is, even the best quality synthetics can still have those sulphur based additives. Mobil-1 is not even a good choice due to those additives. Just stick with a GL-3 or GL-4 and you can be assured the additives are not present. I have heard rumors that a few GL-5 lubes don't have them present but I'm not going to bother researching them when there are good quality non GL-5 lubes like Redine's MT90 available.

Jerry

Earle Hort> I wonder if this applies to synthetics? When I shop for a high quality