I can't tell you what gear to use but I can tell you what RPM I figured out to shift at. I started out shifting at 6000 and starting going down on my shift points and I ran the quickest ET shifting at 5400 rpm. When I was shifting at a higher RPM it would nose down before it shifted. I am using a air shifter so all I had to do was change RPM chips. I only had 1.5 inch block hugger headers with 2 1/2 inch collectors on it so that had to slow me down.