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Front-Wheel Drive (FWD) is a vehicle where only the front wheels are active. In such a system, the transmission is connected to the front wheels and not the rear wheels.

  • Front-wheel drives mostly consist of engine transaxle assembly that is affixed transversely. Short driveshafts or half shafts extend from the transaxle to the driveshaft. It eliminates the long driveshaft required in rear-drive vehicles. It is also capable of eliminating the long tunnel in the floor plan that is required to accommodate the driveshaft.
  • Halshafts can be solid or tubular, equal or unequal in structure and length. Some front wheel drive is capable of having a noticeable torque steer, which is the tendency of cars with unequal length half shafts to pull one side during heavy accelerations. The vehicle pulls towards the side of the longer shaft. 
  • The use of an intermediate shaft enables the use of equal lengths of driveshafts. This helps equalize the torque onto the two front wheels.

Final Drive Gear

  • The final drive is the gear set that transmits torque received from the transmission output to shaft, going to the differential. The gear set is made up of a smaller driving gear or pinion gear and a larger driven gear or commonly known as the ring gear. The smaller hear in a gear set is always the pinion gear.