The Dana 44 can be found 1987 and early 1988 XJ with the 4.0L and tow package, and in the MJ (infrequently, mainly with the Metric Tonne kit) up to 1992.
The AMC20 also put in an appearance in the 1986MJ, and it may have made its way into the 1984-1986XJ as well (but I'd really have to check on that one... I'm sure it was in some early 1986MJ tho - mainly with the Tow or Metric Tonne package.)
This has been per research in Hollander Interchange and Mitchell Parts Interchange (both shop swap guides used in body shops for sourcing repair parts, although the Hollander is still in publication.) Yes, I'm doing research on this stuff - it's part of writing Swappology.
I figure it will not only be a good source for junkyard builders, but may also get used to settle bar bets like this...