What is the best auto tranny fluid?

I just got a performabuilt tranny and I need to know whats the best brand fluid I can use?

Did you ask them on what they recommend you use?

No but I think dex3 might be better than the royal purple stuff

I use regular tranny fluid. Nothing special. A transmission cooler is more important.

Dexron III

i use the new syn. dex 6 i believe it is in my 700r trans. made the shifts really smooth love it!

Dexron-VI -- Introduced in 2006 for GM Hydra-Matic 6L80 6-speed rear-wheel-drive transmissions. Dexron VI now replaces Dexron III and II, and can be used in GM or import transmissions that formerly specified Dexron III or II.

Who makes it? and how much?

All the major oil makers produce it. I can find valvoline in my area pretty easy for $5 a quarts.

i changed the tranny fluid/filter in the monte carlo ss and installed the castrol dexron VI, $6.95 a quart,but the trans shifts are definately smoother. side note:my owners manual called for dexron III with H specification, and the castrol dex VI was the only thing advance auto parts had that had a H specification. what is the deal with the H specification?