[TerryMason]

Now reinstall the transmission pan and the skid plate (don't forget the magnet that goes in the transmission pan - you have to take it from the old one). I then poured my used ATF into some containers – it turns out that I took out 5.5 quarts of fluid, so I put in 5.5 quarts of new ATF+4 as a starting point.

Then start the engine, chock the wheels, and shift the Jeep’s transmission into neutral – this will cause the transmission to pump fluid. Let your Jeep warm up for 10 minutes or so, then while it’s running, shift the transmission into park. With the Jeep still running, check the transmission fluid level. Top it off if you're low, and your'e done!