twolittlebroncos wrote: If I remember correctly there were also a few different transmission/t-cases used in the YJs and while none are great for heavy duty I think they're all serviceable for normal use.
The AX15 and NP231 that were introduced into the YJ are very good and remained in use mostly unchanged for the duration of the 4.0.
Onetrillionrpm wrote: Stay away from late 2000's 01s and 02s with 0331 head castings, they resized he exhaust ports quite a bit which resulted in the heads not responding to overheating very well, the like to crack.
I'm still not quite sure how much of an issue this really is. It's 2000 and 2001 XJs.
My 2000 has 187k miles on it. Original head. No problems. Noticeably peppier than the earlier 4.0s, so i'm ok with any potential reliability tradeoff that doesn't seem to be happening.
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