Transmission Service and Repair

What Is An Automatic Transmission?

There are two basic types of automatic transmission; the front wheel drive version called a Transaxle because it incorporates a differential and a rear wheel drive version called a Transmission that does not.

Most people refer to the transaxle as a transmission and it is close enough. I just wanted to point out the major difference between the two.

Just like that of a manual transmission, the automatic transmission’s primary job is to allow the engine to operate in its narrow range of speeds while providing a wide range of output speeds. An automatic transmission locks and unlocks different sets of gears to the output shaft to achieve the various gear ratios. In an automatic transmission; the same set of gears produces all of the different gear ratios. The planetary gearset is the device that makes this possible in an automatic transmission.