For future posts, I would stick HJ 60 in the title, or post in the diesel section when dealing with diesel drive train issues. I don't think many of the diesel guys do more than glance through this section.
If you swap the entire transfer case, it will be fine. Your 86 will have a 34mm idler shaft and the 89 will have a 38mm idler shaft. Also, the 62 will be vacuum shifted, not sure if a HJ60 is vacuum shifted or not.