ROCK HARVEY
Full Access Member
I used to advocate sticking with ATF since that’s what Ford recommends, until I found out that ZF-5 transmissions are actually used in many other vehicles all over the world. They’re even in Chevy trucks down in south america. ZF recommends their own fluid called “ZF Ecofluid M” which is a 75w-80 fluid for auto or manual transmissions. I use Redline MTL, which is a compatible replacement for the ZF fluid. Glad to hear you’re still having good results with Dextron IV 10 years later!