Ummmmm....my step father (40+ yr mechanic) would disagree. He always told me "don't mix trans fluid or you might get foaming...pick one & stick with it" He most certainly meant "don't mix Dextron II with Type F" based on his age. I've never tested it, but I've always followed his advice.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"