Okay, I did that too. I took the two-speed out and cleaned it. It still did the same thing. So, I went to a smaller range of gears(the stock setup). It still did it. Maybe this is how it's supposed to sound. Does your guys NTC3's shift hard? I've got soo much horsepower that my wheels spin for a while. When I gradually accelerate, the shift is smooth, but when I give it full throttle immediately, the shift is hard. The rpm's shoot up, then it grabs the second gear and takes off. Maybe I'm just not getting enough traction, and therefore spinning the tires when it shifts causing the RPM's to stutter because the car is regaining traction. I don't know, just a thought. Thank you to everyone who's helped out!