Planetary gears fall into this category, and as a technology that has been around for thousands of years, it’s fun to think about them turning away in most modern automatic transmissions.

Planetary Gears If your car had a torque converter and a single forward gear, your forward speed would be severely limited by the engine's operating range and torque production ability. That is why ...

Once that power has been transferred to the transmission’s input shaft, it’s time for the planetary gears to do their thing. The name comes from the way they’re arranged.

A modern automatic transmission uses one or more sets of epicyclic or planetary gears (consisting of a sun, planets, and a ring gear) to achieve many different (typically between two and ten) gear ...

The automatic transmission is made up of three parts: the torque converter, the planetary gears, and the brake bands and clutches. As the engine runs, it spins the torque converter's impeller ...

More and more modern cars only offer automatic transmissions, some of them conventional, and some of them CVTs. What's the difference between them?

With an automatic transmission, sensors factor in engine speed, vehicle speed and brake and throttle use to determine the correct gear, using planetary gear sets, and a torque converter instead of ...

To determine the Low gear ratio, multiply the ratios you've chosen for all of the other gears. In other words, a four-speed could have a Low gear ratio as low as 3.38:1 or as high as 1.95:1.

Automatic transmission rebuilds, on the other hand, can easily cost upwards of $2,000 to $3,000, while complete replacements average more than $3,000 to $5,000.