How many times have you found yourself suddenly confronted by a speed limit sign, then in a panic you look at the bouncing speedometer pointer and immediately start doing math in your head. "Let's see ...
Marlan, I am hoping you can help me. I'm running a TH350 tranny in my 1955 Chevy. It has a stock 3.55:1 rear gear, the plastic drive gear has 20 teeth, and I'm running 15-inch tires. The speedo has ...