Just for grins and giggles have you check the mounts ?? could be a Torque Converter Clutch solenoid, or the shift solenoid is sticking. It might also be the transmission filter is partially clogged also check for a slight wobble in the drive shaft
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Mods-MAc CAI , True Dual Flowmaster 40,3.73 ,T-Lok, 25% UDP, 3/8 Phenolic Intake Spacer ,Steeda Tri-ax, SCT Chip/ Tune
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