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.
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.
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)).
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