I have 4:11 , and it do a good 2nd gear start with lots of smoke, my problem has been that at full speed,6500 RPM, it will not shift into 3rd gear.I put new syncros after every race day, I have ground off every other hard syncro tooth on 3rd gear, I have had the bellhousing zeroed on crank. Liston to the video with me racing the Scott Muffler dragster, you can hear me trying to get into 3rd gear.