[Roadie]

I believe Ford recommends Mercon for the transfer case and Mercon V for the trans. Don't know what Ford would think about synthetic in the transfer case. Probably ok.

The problem I had with RTV is that the lube evidently was continuing to drain a little and got on the RTV and it leaked afterwards. So, I would not use RTV on a gasket. I'm sure if you just used RTV exactly right, it would be okay by itself, but evidently, I did not use it correctly.