ctxj93 Posted January 5, 2014 Share Posted January 5, 2014 I have a 4wd AX-15 in my 89 MJ and I recently scored a 98 AX-15. Is there anything different between the two transmissions other than the slave cylinders? I thought I remember hearing I had to run a pilot or throw out bearing from a 79 CJ or something? Link to comment Share on other sites More sharing options...
87MJTIM Posted January 5, 2014 Share Posted January 5, 2014 You will need the pilot bushing (bearing) for a 74 CJ5 w/ 304ci engine. The throw out bearing is completely diff from 89 to 98. The 89 had the combined slave/TO bearing. The 98 has a separate slave (external) and the throw out bearing. Link to comment Share on other sites More sharing options...
Oyaji Posted January 5, 2014 Share Posted January 5, 2014 Is there no pilot bearing available? Only just a bushing? Has no one tried to source a sealed bearing of correct dimensions anywhere else, like from Motion Industries or elsewhere? Link to comment Share on other sites More sharing options...
ctxj93 Posted January 5, 2014 Author Share Posted January 5, 2014 Thanks! Yeah the 89 is the goofy accordion looking one. So I'll have the pilot bushing for a 74 cj, Clutch, master cylinder and throwout for a 98 and a flywheel for an 89. Link to comment Share on other sites More sharing options...
87MJTIM Posted January 5, 2014 Share Posted January 5, 2014 Yes to the master and slave cylinders from the 98. But the fly wheel, pressure plate and clutch disks remain for the 89. The 89 is Renix and the 98 is HO. The flywheels are diff. The HO will not work on the Renix. Link to comment Share on other sites More sharing options...
87MJTIM Posted January 5, 2014 Share Posted January 5, 2014 Is there no pilot bearing available? Only just a bushing? Has no one tried to source a sealed bearing of correct dimensions anywhere else, like from Motion Industries or elsewhere? I had read on another forum that the "pilot bearing" and "pilot bushing" were the same item just different names. If I am incorrect, please enlighten me. Link to comment Share on other sites More sharing options...
Oyaji Posted January 5, 2014 Share Posted January 5, 2014 They both perform the same function - maintaining center for your pilot shaft - but bushings and bearings are different in what they are made of, their constituent parts, and how well they tolerate wear. A bushing is just one round solid piece with a hole in the middle, made of a softer material (like brass or bronze) than the rotating part that moves inside it, but for limited motion it does just fine. Over time it wears out. A bearing has races for balls or rollers inside, is made of hardened steel, and lasts about a bajillion times longer than a bushing. For a pilot shaft a bushing can be ok, since the clutch spends most of its time engaged (that is, locked to the crankshaft and turning with it, so there is no relative motion between the two and thus no wear in the engaged condition)... but if you have a tendency to sit for extended periods with your clutch disengaged (like at a traffic signal just keeping the pedal to the floor instead of shifting to neutral and letting the pedal up), that is a lot of rotation that adds a lot of wear for a bushing to handle. A pilot bearing is vastly superior in terms of longevity. Link to comment Share on other sites More sharing options...
64 Cheyenne Posted January 7, 2014 Share Posted January 7, 2014 Would be interesting to know if there was a bearing available instead of a bushing.... Link to comment Share on other sites More sharing options...
MancheKid86 Posted January 8, 2014 Share Posted January 8, 2014 Yes to the master and slave cylinders from the 98. But the fly wheel, pressure plate and clutch disks remain for the 89. The 89 is Renix and the 98 is HO. The flywheels are diff. The HO will not work on the Renix. the clutch and pressure plate will infact work from the 98, the only difference in the clutch kit for a 98 is the throwout bearing, disc's are still the same, so in theory you'd need the 98 clutch kit anyways to do the swap properly if going with new internals *which i have done with no problems needed to replace for the swap 1.PB74 pilot bushing 1a. pilot bearing http://www.jcwhitney.com/1972-1975-jeep-cj5/crown-oe-replacement-pilot-bearing/p3049625d1166y1972-1975j1.jcwx 2.98 ax15 + transmission crossmember-(if going from ba10/5) 3.98 clutch kit 4.98 master slave assembly from donor (do not need to remove the assembly two, can remove as a whole unit) 4a.pre-bled master slave assembly from rock auto (worth doing it right the first time) everything else remains the same, do not forget to get the torx e-12 socket for the two upper bolts, every bolt is accessible easily from below if you have enough extensions and lower the tranny a bit (do the top first so you can raise the transmission back up for the final bolts removal) and there are 2 sheetmetal screws on the inspection plate panel, if not removed your going to have fun trying to pull the tranny you can have it done in 4-4.5 hours if you go steady, air tools will increase that time even more Link to comment Share on other sites More sharing options...
ctxj93 Posted January 10, 2014 Author Share Posted January 10, 2014 Great thanks a lot! I'll have to grab one of those external torx sockets too then. Link to comment Share on other sites More sharing options...
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