Hurth Transmission Fluid
KenYou can use either, but never mix the two. Dexron III is just the newest. Make sure you completely drain your old fluid, and then use whatever you have (Ford (ATF) or Dexron). Most recommend that the fluid be pulled out of the TOP of the housing,because there's either a crush washer at the bottom which needs replacement or there is a stainless plug in the aluminum housing at the bottom. I apologize for forgetting which it is, but I use a syringe with a hose to pull out the old fluid from the top. Some use a turkey baster with a hose. It's not that hard.Stu