The shop that rebuilt the double cardan and stud ball on my drivesahft also welded a cap onto the outer end of the slip-yoke tube.

In an earlier post in this thread McQ said he used an IFS front shaft on his '84. I just remembered, I still have my '89 4runner parts truck, which has a front shaft that's not doing anything useful right now. I should give that a try. Any reason it wouldn't work?

'89 4runner SR5, 3.0, auto (fun)
'93 xtra cab, dlx,3.0, 5spd (work truck)