The genuine bushes are softer and allow more wheel travel, when I was building A frame rear suspension for my old GQ I found the genuine bushes lasted better and gave better travel,I still dont trust the polyurethane bushes, if they were that good, why arent they standard?

Dexron 3? :O in the transfer case? I would think a good gear oil 80w would be recommended.
its just a case filled with sprockets and a chain.