The most popular transmission modifications for cars equipped with automatics are valve body reprogramming kits and torque converters. Valve body kits are generally called upon to increase shift ...

Several years ago, the idea of going circle track racing with an automatic transmission in your car was considered lunacy. Automatic transmissions back in the day weren't called "slush boxes" without ...

For straight line guys, spending hundreds of dollars on something that doesn't give you any extra horsepower doesn't exactly seem like a good deal. Even a federal bean counter could figure that one ...

Viewer-submitted questions for The Car Doctor: Q: I have a 2017 Honda Ridgeline (66k miles) without four-wheel drive. I know there is an issue with the transmission that causes the truck to vibrate at ...

In our last episode (Mar. '10) we dyno tested a slew of bolt-ons and the new Precision Turbo (#PTB305-5857) on our Grand National test car. With these upgrades we anticipated possibly breaking into ...