Section 128 (Automatic Transmission - 4T45-E - Symptom Troubleshooting And Diagnosis): Vibration

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Torque Converter (55)	Out of balance Internal Failure
Transmission or Engine	Misaligned
Output (94) or Stub Shafts (58)	Out of balance Worn or damaged bushings
Turbine Shaft (39)	Out of balance Worn bushings