I've thought of making my own ATF flush machine. Need 2 five-gallon buckets (approx) and a wooden box to put them on. The source bucket up top (for gravity feed) and the old fluid bucket on the bottom. Run clear hoses from each bucket to the appropriate lines on the ATF cooler. Top bucket to the inlet and bottom bucket to the ATF outlet. Fill the top bucket with fresh ATF and open the line to the cooler. Now turn on the vehicle and the ATF should go down from the top bucket into the cooler line and back out to the bottom bucket. When you're in the driver seat and see the top bucket going empty, then turn off the truck and you're done. Just an idea been tossing around in my head. Any suggestions or ideas?