Hey guys. So appreciative of all the great info. I just bought a JK Sahara with 70K on it. I did both axles (Lucas Gear Oil 80W-90) & the transfer case (Carquest ATF+4). I filled everything until it started coming back out & sealed em up. I read on another site that too much oil can cause foaming? Also, what if there was some ATF in the hand pump when I put the gear oil in & vice versa? Not a lot, I pumped it out as best I could and even pumped some new fluid in to force the old out. I felt like it took a little more gas to get it rolling to 40 or 50 mph today & it was my first DIY so I'm being paranoid. No weird smells or anything.