Actually, all Wags and Grand Wags, as wel as Cherokees and J-trucks, used D44 front ends from '80-'91 (the '86-'91 range was for the D44 in back).
You don't want a J-truck or Wide-track Cherokee front axle, as it would be too wide for your application. You also want to avoid the '83-'84 Selectrac vehicles, as they had an oddball vacuum-disconnect front end.
* '78 Cherokee 4-door "S"
* '88 Grand Wagoneer
* '84 XJ Cherokee 2-door FOR SALE- $600
All that and more on the page below:
<a href="http://home.off-road.com/~wagoneer/" target="_blank">http://home.off-road.com/~wagoneer/</a>