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DEX 3 (I think the dip stick on my truck is actually stamped IIE but 3 is the replacement). You'll get a thousand different answers on brand, pick one you like, I like synthetic...
Atleast dex 3 like they spec'd from the factory, anything above that will be fine dex 6 is synthetic, also a repair manual will tell you this, always good to own one of those.
Might as well use Dex VI because that's the current fluid since like 2005-2006. Dex III is phased out and anything you find that actually says "Dexron III" is old stock. You might find fluid that says it's COMPATIBLE with Dex III but that's what is known as unlicensed...