To my knowledge the only Disney animated movie that had Steampunk elements as a part of the plot was Atlantis: The Lost Empire. Disney fan art is quickly filling the void.
A few months back Bjorn Hurri delivered a convincingly magical Star Wars universe.
Now digital artist Mecanique Fairy is making it her quest to paint the Disney universe in steam mechanics. The villains seem to make a better transition than the princesses. There must be something about evil that makes it a better "retro"-fit.