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Dollars to donuts your transmission is fucked! This is exactly what led me to getting a PDS transmission. If it's happening as you downshift into 3rd or 6th aggressively, it is def your issue.
To verify you'll need an actual scanner. BM3 wont do it. You'll need to log the transmission TURBINE SPEED to the OUTPUT SPEED sensors. Drive it while logging. Do the aggressive downshift. Pause the log and zoom in. Did the turbine speed drop by 50rpm as compared to output speed? If yes, replace the transmission.
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