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Just replaced the GM dino-based ATF fluid that was put in there following my last 5-6 synchro rebuild with Royal Purple Synchromax. I had Synchromax in there prior to the synchro iwarranty issue, and I missed it...

She's shifting better than ever.

Easiest, most effective mod M6 owners can do- especially if you run a GMM. Big difference.
 

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right on Groucho, anyone changing out their shifter on their GTO, should change their tranny fluid. Personally I used the Royal Purple also.
Big Difference. but you can't go wrong with either RP, Torco, or Amsoil.
all are top notch fluids.
 
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