I'm planning on changing the fluid in my front and rear diffs for the first time this weekend. I've never done it before so I have some questions, what kind of fluid should I use? Synthetic or normal. Should I use royal purple? I've heard that's a good brand. Should I use a gasket, sealant, or both? I have a 2012 wrangler Sahara with almost 26,000 miles.
Thanks in advance!