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post #1 of 9 Old 04-21-2013, 02:31 PM Thread Starter
Exit93
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trans swap

Will an 89 AX-15 work in an 91 yj with no modifications?

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post #2 of 9 Old 04-21-2013, 03:17 PM
4.7stroker
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post #3 of 9 Old 04-21-2013, 03:25 PM Thread Starter
Exit93
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Pilot bearing?
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post #4 of 9 Old 04-21-2013, 03:55 PM
4.7stroker
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That is the bearing inside the crankshaft that the tranny input shaft fits into. It changed size but I do not know when.

Dwayne
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post #5 of 9 Old 04-21-2013, 04:44 PM Thread Starter
Exit93
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Does any one know the size I need? Maybe Mean Max can help?
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post #6 of 9 Old 04-21-2013, 05:25 PM
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post #7 of 9 Old 04-21-2013, 07:19 PM
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Pilot shaft/bushing should be the same on a 91 as an 89.

As you may know, 89 was a mixed year for manual transmissions....some still came w/ the BA-10.

As above, you need the clutch for the 91 4.0....not the 4.2.

probably out breaking stuff.
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post #8 of 9 Old 04-21-2013, 09:55 PM
Fenix85182
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I replaced the AX-15 in my '89 with an AX-15 out of a '94 Cherokee years ago and the pilot bearing was definitely a different size. The diameter of the pilot bearing was larger on the 4.2L crankshaft than on the 4.0L crankshaft my newer AX-15 was mounted to. I believe you have to get a special bearing to mate a newer tranny with the older motor, otherwise the smaller pilot bearing in the old crankshaft will be like a hot dog in a hallway.

Just make sure the bearing matches the input shaft of the transmission and the outer diameter matches the crankshaft.

2005 Jeep Wrangler TJ Sport
2009 Honda Accord EX
2008 Honda CBR600RR Graffiti Edition
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post #9 of 9 Old 04-22-2013, 05:23 AM
Beachcruiser
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the later model AX-15s have a pilot bearing with an ID of 0.7518 inches, and an OD of 1.8161 inches, depth of 0.565 inches (OE part number 53009181 )

the early model AX-15s have a pilot bearing with an ID of 0.5934 inches, and an OD of 1.055 inches, depth of 0.719 inches (OE part number 33004041)

If you are using an .75 shaft AX-15 in an older 4.0 you will need an adapter pilot

A pilot bushing out of an early 70s CJ with a 304 V8 and the T15 will work

It has a pilot bearing with an ID of 0.751 inches, and an OD of 1.056 inches, depth of 0.88 inches

National part number PB77HD and [COLOR=blue !important][COLOR=blue !important]Dorman[/COLOR][/COLOR] part number 14674

If the new trans shaft measures around 5/8...rather than 3/4", you should be fine.

probably out breaking stuff.
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