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Message: <blockquote data-quote="wolverine" data-source="post: 639150" data-attributes="member: 532">Firstly, u need to specify what engine & year model is the car...In general,1) try to determine if the jerk & thud feels like from the gearbox or chasis. If the gearbox, which most of the time will record a fault code, are the sensors inside gearbox. Can be replaced easily & cheap too. Also, fresh gearbox fluid with new filter will help a lot. If it feels like the chasis, hoist the car & check for the front arms bushes, rear subframe bushes, rear differential mounting too.2) humming sound from engine could be from alternator, belt tensioners, even water pump...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool    :cool:" loading="lazy" data-shortname=":cool:" /></blockquote>