Just thought I'd update this thread, I've been running Amsoil ATF in the Galant for the past few months and I would highly recommend it above and beyond Dextron III oils. Note that this is one of the few oils that meets the Mitsubishi Diaqueen \ Diamond SP II and III grades recommended for use in the FTOs tiptronic gearbox. Its been muted that Dextron III doesn't contain the right friction inhibitors which can result in erratic auto gear changes. Note that the boiling point of Amsoil ATF is 100 deg C higher than Dextron III, once the oil overheats, it significantly looses its ability to properly lubricate the 'box internals which can in turn lead to premature transmission failure.
Amsoil ATF isn't cheap but its highly regarded. My personal recommendation is to use it over Dextron III the next time you change the ATF (note I have no affiliation with any of the companies listed, just sharing my experiences).
Its available online from the following 2 companies:
http://www.performanceoilsltd.co.uk/aut ... fluid.html
http://www.opieoils.co.uk/p-1052-amsoil ... d-atf.aspx
Bearing in mind peoples recent recent gearbox issues, check your auto fluid levels (when hot) and condition today. If its bright red than its most likely fine, if its brown then its cooked and should be replaced ASAP.
CJ