Went to the dealer to ask about 20 questions. The guy at the parts counter, who I know has been there years, because I’ve dealt with him before, said Mercon V. It’s backwards compatible for Mercon (which is what this transmission originally took). He said it was about $6 a quart from them, takes almost 3 quarts. He couldn’t find anything on change intervals. Automatics are 30,000, he said, but there was nothing for the R1HD. Then he told me he would personally do a full synthetic and never bother changing it again. They didn’t offer any full synthetic for this application, go to parts store or online.
Went to parts store... narrowed it down to Mobile1 full synthetic ATF. Said it was for a Ford Mercon applications about $11 a quart. Also saw a Lucas semi-synthetic ATF. The first thing it listed on the inner back label was compatible with Ford Mercon. About $8.50 a quart.
The dealer also said that the power steering takes the same thing, Mercon/Mercon V. And finally I learned how much our power steering systems take... 2.1 pints (according to the guy at the dealer parts counter. SO... what say I get TWO QUARTS of the Mobile1, TWO QUARTS of the Lucas and mix them and change out my transmission fluid and the rest use in my power steering, after I suck off the the stuff in the reservoir? I like Lucas products, but I know Mobile1 is good. What would you guys recommend?