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Unread 04-21-2013, 02:31 PM   #1
Exit93
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1991 YJ Wrangler 
 
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trans swap

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

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Unread 04-21-2013, 03:17 PM   #2
4.7stroker
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As far as I know. Watch that pilot bearing though.

Dwayne
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Unread 04-21-2013, 03:25 PM   #3
Exit93
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Pilot bearing?
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Unread 04-21-2013, 03:55 PM   #4
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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Unread 04-21-2013, 04:44 PM   #5
Exit93
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Does any one know the size I need? Maybe Mean Max can help?
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Unread 04-21-2013, 05:25 PM   #6
4.7stroker
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Just buy the clutch for the 91 tranny and you should be golden.

Dwayne
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Unread 04-21-2013, 07:19 PM   #7
Beachcruiser
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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.
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Unread 04-21-2013, 09:55 PM   #8
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.
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Unread 04-22-2013, 05:23 AM   #9
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.
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