ATF was used in later years, but Mobil 1 5w-30 works best.
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We alway's ran the Mopar fluid. When I met Chris we switched to Mobil 1 without a problem.

I was sponsored in Grand Am Cup by Royal Purple. The only trans failures I ever had in my Cobra R's was from using their trans fluid and not the recomended SynchroMesh GM fluid for our Tremecs. Lost two trans in two cars in one weekend. That hurt. We went back to Synchromesh.

I am not big on switching from the proven. When Chris / Skytek / Fernandez said Mobil 1 that was good enough for me.