Thanks guys! It is a mystery why there are so many different types out there. I went to Mobil 1's site are read a disclaimer that it is not for older Fords. Yet that is exactly what the transmission guy recogmended. He said with the synthetics it doesn't matter?
But he also is a nice guy, highly recommended by all the local shops! When I went to Napa Auto, they didn't sell the mobil one, so I picked up the Castrol Oil brand. It says on the bottle for type F transmissions. My tranny is out of a 71 lincoln, so it is an older model, yet it was just rebuilt within the last year.
After reading the above post, I read the fine print on the back of the Mercon 5 atf. It says certified use in all Ford That require Mercon or Mercon V, but lower down, not for use in applications calling for Mercon SP or type F.........................Yikes!
Dam fine print, fortunately I haven't put any fluid in anything yet! Thanks for the warning Dave!