I just installed a set of 3.73:1 gears in my 82. Somehow, I managed to forget about the speedo until after the fact. Does anyone know which speedo drive gear I need for my 700r4? I am basically running a stock tire, and I think that the tranny is from an 85 or 86 Astro. (My tranny guy selected this tranny to build) So now at highway speeds my 85 MPH speedo is pegged. This leads me to question #2. Does anyone have exeriece good or bad that they could share about the 165 mph speedometer conversions?