David is correct. Loose as a goose gets your down the track where you want to be. We are normally a 1.10-1.11 60 ' using a 34.5 tire and run 4.77-4.80 range at 145 mph. Unless you are looking to quick race and squeeze every ounce of ET out of your combo, loosen that converter and get the bigger tire on it. That thing will hook on an ice rink and repeat all day long.