It's good that the u-joint was replaced. They will sometimes wear sort of a notch in them due to operating in almost the same place all the time. I have cured the vibration when this has been the problem by putting a washer on the passenger side of the carrier between the carrier and the body. This causes the u joint to operate in a slightly different position. Since you've replaced the joint this is not a factor.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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