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Tranny rattles. But when I accelerate it stops. It only does this when stop/go. on 2001 Buick LeSabre

My 01 Buick lesabre has a rattling noise coming from underneath it. I had the tranny fluid and filter changed what could be the cause of the rattling sound?

Asked by for the 2001 Buick LeSabre
Most likely broken/loose catalyst inside the converter! (Catalytic converter) Or loose exhaust heat shield.
Thank you so much
1 more answer , 1 more comment
agree with #1 or poss cracked flex plate
Thanks you guys were helpful.
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