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Unread 09-16-2010, 12:17 PM   #1
bigbike
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1995 XJ Cherokee 
 
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YJ trans issues

Hokay, im an XJ guy, but a friend of mine got a yj. Its a 90 2.5, 5spd(ax-5??) 231. The trans wont go into 1st gear unless you double clutch it, presuming its in not so good shape cause the PO left it in a swamp for a week, what would a be a good trans to bolt in? AX-15?? AW4?? he would preffer something bolt in but strong.

Are Ax5s really weak? ive heard they are.

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Unread 09-16-2010, 12:33 PM   #2
paultyler
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1992 YJ Wrangler 
 
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Yes they are lightweight. They become an issue when you get larger tires. The issue arises not off road but on the highway. When geared down in 4low they rarely break because there is less stress on them in these situations.

The problems arise when you on underpowered on the highway and roll around with the pedal floored to get your speed up. That's when they usually develop problems. Often what goes is just the 5th gear as it is held on by a snap ring that can pop off....as I am experiencing right now.

As for replacements nothing will simply bolt in. If you get an AX15, which is probably the best option you will need to get a new bellhousing. Plus the shaft on an AX5 is 21 splines and an AX15 is 23 I think. Therefore some modification will be required. Also, your driveshafts may need to be shortened or lengthened. It turns into a modestly expensive job when you consider you can get a used AX5 for $250-$400 and rebuilt one for $750.

This is a dilemma I have faced for years. I have gone through 4 AX5s but each time I simply replaced it.
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Unread 09-16-2010, 12:44 PM   #3
CreepyCrawler95
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1995 YJ Wrangler 
 
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if you can find a dodge dakota with the 2.5l you can take out the entire power and drivetrain. the dakota 2.5l came backed with an AX15 with the necessary bellhousing for adaptation. othersie you can get an ax15 and buy the bellhousing online new (not too pricey forgot site also (or go to dealer)).
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Unread 09-16-2010, 03:55 PM   #4
imstillatwork
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are the 2.5 ax15s better geared than the jeep 4.0 ax15s? I never liked the idea of putting the ax15 on a 2.5 becuase the gears are even higher than the ax5
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Unread 09-16-2010, 05:48 PM   #5
mikeys91
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1991 YJ Wrangler 
 
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I may be having a problem with my 1991 4.0. Not sure which transmission I have. Are they all the same for the 2.5 4-Cyl. and the 4.0 HO?
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Unread 09-16-2010, 09:54 PM   #6
CreepyCrawler95
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there is little difference in the gearing of the 2 trannies. since hes running a 4banger hes already got decent (stock) gears...unless youve geared lower. what size tire is your buddy running?
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Unread 09-16-2010, 10:43 PM   #7
CreepyCrawler95
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no the 2.5 is backed by the ax5 and the 4.0 is backed with the ax15 for all manual yj models.the BA-10 came behind the 258 I6 i believe only other tranny i know of behind the 4.0 is the nv3550 in tj models...idk about jks
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