I'm looking to change my rear differential fluid. Just did my transfer case fluid with no problem. I know the differential is supposed to be sealed for life, but I do some off roading and definitely submerged it dozens of time. Not to mention I now have almost 145,000 miles and would like to get fresh oil in there. Now, I see the 3/4 inch drain hole, and there's a plug directly above it that's 3/8, but I don't believe that's the fill plug. I read on the forums that the fill plug is 1/2 inch, but I don't see it on the axle anywhere. It's a little tight in there, so maybe I'm just missing something. I watched the thread on how to change the fluid a dozen times under the differential/transfer case/transmission section, but that was from a older generation explorer and ours look a lot different back there. Does anybody know where the fill plug is on the rear differential? Thanks.