***UPDATE***
Neighbor is giving me a full width 44 and 9 inch out from under a SASed S10 that he is going to scrap with a set of 15x10 aluminum wheels, just for rebuilding two carburetors for him.
Front...
Rebuild with new seals and bearings
Regear to 4.56 to match 9 inch that is already geared to 4.56
Limited slip or aussie locker
1 piece coil/control arm mounts (similar to these but not from Ballistic)
http://www.ballisticfabrication.com/Flat-bottom-radius-arm-coil-mounts_p_1184.html
"Y" style tube radius arm setup with heims at the frame and bushings at the axle
Heimed cross-over steering.
Rear...
Rebuild with new seals and bearings
Install locking differential of some type
"Daytona" pinion support
Swap to disk brakes.
The money I would spend correcting the steering on my Explorer will buy most, if not all, of my parts...