'14 Ram 2500 Axle Seals Leaking

I don't want to start a discussion over differential fluids but my good friend is the service manager at Freightliner of Toledo (I retired from there) and he told me to never change from the factory type of lubricant. My rear (and front) takes 90 weight GL5 Hypoid oil and that is what I always use and I change mine every 2 years as a rule. You'd be amazed how contaminated it can get from condensed moisture in the housings, especially up here in the cold north.

I use Detroit Diesel gasket maker instead of RTV. Don't believe you can buy it, it's a shop item but I can get it from Freightliner. Stuff is fantastic. All they use on Detroit Diesel engines.