I have a really quick question:
Once the rear axle is in and the level of oil is correct, why do you need to grease the bearings? They are sitting in a layer of oil. In big trucks the front axle is typically oil bath and they go 4-500,000 miles if needed. I could see if wiping the bearing with grease before install so you don't go dry. I am not knocking your info, I just don't understand why.

Also, Napa and Advance Auto sell a gasket for the rear center chuck. No rtv, no waiting for dry or goop mushing out. Again... not debating your reasons, I just do not like silicon especially with oil submersion. I have not has good luck with it as a full on gasket. I did however have a lot of luck with an anaerobic sealer.

Good luck.
Joe