How to Replace Differential Fluid

Last fall I tackled the job of replacing the power train fluids on my Jeep. Unfortunately I ran out of time and was only able to top off the differential fluid. All the guides I could find on the internet recommended removing the cover plate to drain the oil and replacing the gasket. I didn't want to go down this road. My differential wasn't leaking, so I didn't need to replace the gasket. And I was a little worried about shearing off the rusty bolts. So I figured out a workaround- siphon out the old fluid. First, pry off the rubber plug.
To remove the fluid I'm using a siphon tube with a pressure ball. You don't want to start the siphon with your mouth! It's a good idea to do this on a warm day or after driving to warm up the fluid, as it will flow better.
When all the fluid is removed, add the new fluid to the fill hole until full to the hole level.
You probably won't be able to remove every last drop of oil, but the siphon method will remove the vast majority of the fluid. It's also much easier and less messy!