I have a 2003 f350 6ltpsd and I need to change transfer case fluid..I purchased a gal of valvoline ATF good for dextron111/mercon can I use this as book with truck calls for mercon ..this atf is good for dextron and mercon both ,its not synth..with thanks the winemaker..drink red wine

 

As long as it is Mercon rated you are just fine, which it looks like it is. Another way to confirm is to look for specification number "M2C166-H" printed on the bottle.