i always get conflicting answers to this question and it seems like no one i ask is 100% sure,

what 231's will swap in place of a 249 or in place of a 242, i know it depends on the year but i never seems like anyone knows for sure what year 231 swaps in directly

any help would be greatly apreciated!

I'm going to pull mine this weekend for the swap.From what I've read,The main thing you need to know is the input lenght.I'm going to bring mine down to the jeep only junk yard and find one that has the same input shaft lenght. I,ve also read not to get one from a yj,I can't remember why.