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just put Royal Purple syncro mesh in my m6 1-2 same 2-3 and 3-4 shift smoother and faster ( right where I need it for Drag racing) sythetic can hold up better the the other stuff that GM recomends. Least thats what the guys at GM told me
I have used royal purple synchromax in my '01 Z06 and have had some high tranny temps at the end of the 30 minute runns with the SCCA and I have had no problems with the transmission or with shifting.
I use the royal purlple Max Gear for the diff and was told by royal purple that the additive was not necessary.
I put Royal Purple Syncromax in my manual tranny 1 week ago. Now it sounds like the tranny is going to fly apart. It is making alot of metal on metal clanking noises. This weekend I'm going to switch back to Dextron III to see if that helps. It could be a coincidence. I will send out an update after I do the work.