Knowing your driving speed is extremely important for long drives, a trip to the local market, or just a short weekend getaway. Vehicles have various safety features loaded into them, but one of the ...

If you drive your hot rod, even once in a while, then you depend on all of your gauges to be reliable and accurate. Just a small percentage of miscalibration can result in engine damage or failure, ...

If you've ever modified a car with smaller or larger tires or, perhaps, a different final-drive gear, you've immediately screwed up your speedometer. This is, of course, annoying, but for modern cars ...

Regularly changing your tires in pairs with the properly assigned tire and wheel size isn't going to impact your car at all. But what about if you want bigger tires? Or smaller ones? The short answer ...

Speedometer-gear calibration and selection should be an integral part of any changes to your Mustang's chassis or driveline. Changes to wheel and tire size alter the speedometer reading because the ...

We don't have to tell you that late-model overdrive transmissions have become a prototypical upgrade for any kind of performance car. The number and variety of these transmissions makes that decision ...