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Assuming you are asking about the universal couplings (joints) in the drive shaft, these joints are needed because the engine is fixed to the vehicle's chassis (frame) whereas the wheels are suspended from the chassis. This means that the wheels able to move relative to the engine and transmission, so there must be a mechanism that accomodates this movement. This is most commonly done with u-joints in the driveshaft on rear-wheel or four-wheel drive. On front-wheel drive, this is often done with CV-joints.

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17y ago

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