That a huge can of worms.
The only passenger side diff "readily" available for that swap would be scout 44.
Otherwise, most pass drop 44's will be out of full size trucks. Early chevs, suburbans, some dogdes...etc etc. Which most except maybe the dodge ones will have the wrong bolt pattern. Meaning you would have to source a bunch of ford or dodge outer stuff to get back to 5 x 5.5.
Also, a spring over CJ with a fullsize diff usually means you have to outboard the leafs, which is a ton of fabrication. At that point, its almost easier to link it.
Personally, I would call currie and see what it would take to get you into one of their 9" diffs with a 30 spline carrier and d44 inner C's.
Then source yourself a combonation of ford hubs, chev flat top knuckles, ford spindles, etc etc.
I dont remember the exact recipe, you will have to search around.