AX-15/NP-231 in a CJ?
Howdy. A buddy of mine is thinking of rebuilding his old CJ-5 that has a 74 model 4.2 liter 6 but no tranny or t-case. He wants some good low range options, but doesn't want to spend a lot of cash. A T-18 with a Dana-300 would be ideal, but would be very expensive. A rebuilt T-18 costs $1000 alone, with another $200 for a D-20 and even more for a D-300.
Anyway, how would an AX-15 and NP-231 work on a CJ? The AX has a reasonably low first (just a bit higher than a standard T-18's) and the NP-231 has a better low range than a D-20. And (I'm getting to the question) they're so common that I would think you could buy a used tranny/t-case setup for not much.
And are they strong enough for a rig with 33" tires and lockers? I've not heard of people having problems, but the aluminum AX and chain drive NP aren't the tractor tranny that the T-18 is, for instance.
Oh, yeah, there's the other question--I know that this tranny was used on the 258 in the YJ and that the 4.2 and 4.0 blocks are very similar, but will it bolt up? If it's not a direct replacement, what is involved? Thanks!