My 71 Scamps speedometer is way off. It was born with a 904 trans and 2.76 rear and now has a 3.23. I'm running 225/60R 14 tires which are 24" in diameter. According to the chart I need a 35 tooth gear, does that sound correct? I was out today and the speedometer said 40 but GPS on my phone was saying about 30 MPH.
Mancini
Mancini Racing - 35 - Tooth Speedometer Gear