Clunk sound shifting from 2nd to 3rd

Jim Johnson

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I have a 2007 early 1500 that has had not one but three transmissions replaced. Two at an ASE Certified shop and one at a Chevrolet Dealership.
Same exact issue, driving normally with shifter in overdrive position, acceleration normal, not gunning it, I hear a clunk going from second to third gear. Three mechanics are stumped. Going back to the dealership soon and wondering if anyone has heard of something that I can forward to the mechanic this time?
Thank you, Jim
 
Did any of these shops check for technical service bulletins?
 
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