Drivetrain 1990 5.0 t5 fluid help

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Spec is Dextron 3/Mercon conventional. It's hard to get locally now days but Castrol still makes it and you can get that at Advance Auto.

I've ran Mobile synthetic ATF, Amsoil ATF, Dextron 3, and Royal Purple SyncroMax. The Royal Purple by far did the best in my T5.