A retired airline pilot who owned and maintained a Mercedes 600, and Delorean and several vintage Cadillacs gave me the best advice: "Always check the easy things first - most often that is what is causing the problem. Only after they all check out do you move on to bigger issues." I.e., if there is vibration going down the road, don't assume a bad torque converter or a driveshaft rebuild is needed. Check tire balance first.
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