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Tires and wheels are important to vehicle ride, handling, and fuel economy.

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In an automatic transmission, gear ratios are changed automatically.

The power tarin includes transmission, clutch, differential and drive shaft.

A motor vehicle consists of a number of sections which, for convenience , can be considered as follows: the engine assembly, the frame or chassis, the power train, the running gear, the electrical system and the body of the vehicle.

The drive shaft connects the transmission output shaft to the differential pinion shaft.