Aside from the engine itself, a car’s transmission is the most important part of the drivetrain. Without a transmission, the car won’t be able to move. While transmissions have been around since the advent of motorized transportation, they are more complex than just a metal box of gears. In rear-wheel drive cars, the transmission is connected to the engine’s output shaft and transmits rotational power to the rear differential, which then delivers power to the rear wheels. In contrast, front-wheel drive cars use a transaxle, which not only delivers power to the drive wheels but also acts as an axle for the vehicle.
Compact Power Delivery
In older muscle cars, the engine’s power comes from the rear of the vehicle. In most economy cars, the engine is sideways or “transversely” mounted. A transaxle in these cars is connected to the engine’s output shaft, but instead of running the entire length of the car, it delivers rotational power to an automatic or manual gearbox, and then through a short shaft to the wheels. This method is more compact compared to a conventional transmission but achieves the same result of making the wheels spin.
It is worth noting that transaxles are not exclusive to front-wheel drive cars. The $300,000 800-horsepower super Ford Mustang GTD, for example, uses a transaxle to distribute weight more effectively. It even has its own dedicated cooler mounted to the dual-clutch eight-speed gearbox.