Just did a swap of shifters along with the anti venom mod. I had royal purple in the trans but I never liked the first to second shift and cold performance. End results is a complete transformation. The shifts and now smooth between gears with no notchy feeling. Just feels better. Core shifters are not too popular but I love how it feels. Too me having the longer hurst shift handle feels way more ergonomic. I don’t think I ever noticed but my T56 has a Dexron III fluid tag on it. While I’m sure the royal purple may last longer, I’ll just change the fluid once a year with Dexron III.