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Your question leaves a lot of unanswered questions. If "the engine thumps" each time you shift between drive and reverse, it could be a failing universal joint. This would definitely be more noticible (and damaging)when shifting at higher engine speed . you said that your engine was racing at ~2k rpm ; that sounds like a separate problem...stuck choke, linkage, etc...that should also be fixed, because engageing gears at those rpms is BAD for the entire drivetrain.

I had the same problem with a grand am I had I would have your motor mounts checked

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โˆ™ 2009-12-01 07:03:58
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Q: What causes a loud thump in the engine for a 2005 Chrysler 300?
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