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Ax-15 Swap Question


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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? 

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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.

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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.

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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.

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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.

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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

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