Ford Transmission

I would drop the pan and drain the fluid, check the magnet on the bottom of the pan for, material buildup(don't be surprised at the stuff stuck to the magnet), change filter and reassemble pan bolts. You would be better off using the OEM gasket rather than the new rubber gasket from the kit from Autozone or wherever you buy the kit, I have had these rubber ones leak. The OEM gasket that came with mine has steel bushings around each hole for the pan bolts. Once you fill the pan if you disconnect the input hose to the oil cooler and start the engine it will pump out the rest of the old fluid from the TC while you add new fluid to the filler tube. When you see the new fluid coming out red you know you have all the old fluid out. I use white tissue paper with new fluid on it to use as a guide. Each fluid change I saw less stuff on the magnet. I have changed mine 3 times,every 30,000 miles. Knowing what I know now I would have put an extra magnet in the bottom of the pan to pick up more of the magnetic wear particles.