Decided to change the transmission fluid in pan and the external filter on the truck. Don't think previous owner ever did. Only had 63K on in when I got it. Now at 70K. The change only set me back 108 for three gallons of Transynd and spin off filter. Seen the transynd going for around 40 and i got it for only 30. So im happy. I know it should only take two gallons to do the change but I rather have too much than not enough.