AX4 to AX5 89 MJ

[Norton]

So I have an ‘89 Manche 4wd with the 2.5L and an AX4. I want to swap in an AX5 for better mileage on the highway and so I’m not revving the hell out of her going any faster than 65. I’ve checked the forums extensively but am having trouble getting a straight answer: Is the swap as simple as unbolting the AX4 and putting in an AX5? Are the transfer case, shifter, syncros etc. something I will have to bother with at all? Or is it quite literally plug and play? My local scrapyard has an AX5 from a 93 Cherokee, that is probably what I would put into it.