Current plan: keep limping.
New trans fluid and filter, O2 sensor Saturday morning before Erik's. (anyone need a ride?)
Next week: engine oil, trans again, diffs, tcase. Weld frame cracks. Put seal kit in steering box. Pretend it's fine! It probably will be again for a little while.
After that it's debatable. maybe new front springs, remove add-a-leaf, bushings in spring shackles with fresh bolts & new front spring hangers? Redo front links with big joints? hydro steering and knuckles? (and a cage and seats and a chassis and coilovers...) That's when it runs away.