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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Redline, Amsoil, and Mobil 1 synthetic are all good synthetics. Just get the right weight to match your application. It's listed in the owners manual if you want to go spec.
And make sure you loop those bolt holes good with RTV and let it set up a little bit before adding the oil back into the diff case.