It only makes one thump/clunk when it shifts gears and sometimes is louder than other times.What causes a clunk or thump sound in our 2000 Buick Lesabre when it automatically shifts gears?I am leaning more towards a broken motor mount or transmission mount or bushing.What causes a clunk or thump sound in our 2000 Buick Lesabre when it automatically shifts gears?bad transmissionWhat causes a clunk or thump sound in our 2000 Buick Lesabre when it automatically shifts gears?Could have an air leak in one of the vacuum cables. Could need transmission fluid.What causes a clunk or thump sound in our 2000 Buick Lesabre when it automatically shifts gears?
A broken motor mount.
Bad ujoints.
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