I felt the same way with mine. As soon as I hit 1500 miles, the fluid came out and the royal purple went in. It shifts much smoother now, even cold. I bought the fluid and had the dealership do the fluid swap as I didn't have jack pads at the time. They charged me around $120 for tranny, and $80 for my rear diff. Aftermarket Rear diff fluid is iffy from my understanding, so I just kept the stock fluid. I put redline in my other car(frs), that stuff is amazing as well, but it's a completely different transmission. Both work great and I'd recommend both, from my research, Corvette owners loved the purp!
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