(hit the 2x) This is a Cardan Joint (or Universal Joint). Its velocity is not constant -- check out the attachment to see the math describing the variation in speed.
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If your universal joint or drive shaft is making noise, you may need to replace your universal joint. This printable step-by-step how to with detailed photos will help you replace your universal joint and save lots of cash.
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Reinstallation of universal joint parts.
Car care/car repair automotive maintenance tips
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