Hey I really appreciate all the advise on this site. I have a new question for you. I had to add some transmission fluid the other day. Old yeller has a 318 mated with the 727 transmission. I am supposed to use Dex II or III which I couldn't find in the auto parts store. I was told they haven't made that in years. I would like to change the fluid and filter. What do you think I should go with?