Differentials, transmission, transfer case are all 80W90 hypoid, preferably GL3 but that is now hard to find. It is said that the GL4 is hard on the brass parts, such as the synchros in the transmission on 2 and 3 gear. Some of the synthetics are rated GL3 such as royal purple, but you may find the synthetics tend to leak a little more.
I see on your other thread some of the parts you are looking for. Hard to believe that it had a frame up restoration but needs
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pitman arm, draglink, bellcrank (and hardware), thermostat (which one?) as well as parts for the steering box
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I would suggest you check your kingpins.
Easy way to check them is you jack the truck up, remove the wheels, and disconnect the knuckle from the tie rod. Then turn the knuckle thru it's ranges and if it feels rough, then you need the bearings.
If your Jeep has the incredible uncontrollable wobble, it is often a combination of wear in all of the steering system, kingpin bearings included.
The kingpin bearing and cone are pn 11590/11520. If you buy them up here they will easily run you $30 each. Off ebay you should be able to get them for about $10 each.
http://www.ebay.com/itm/11590-11520-...sAAOSwstxVUfDD