Check NAPA for Dex/Mercon. That is what I use in my Jeep Cherokees. Some of the Jeep guys are using synthetic Dex/Mercon. The AW4 in them has some issues with the ATF+4 that Chrysler uses in them. Yes, different trans. I also use a bottle of the Lube Guard. I think my trans shifted better this past trip in the WV mountains. I did drain and add a bottle of Lube Guard. I also installed a header to replace the cat iron exhaust manifolds. Didn't feel like any real power increase. Ran a bit smoother though.