Section 4 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting): Troubleshooting: Vibration

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Vibration

Checks	Cause
Torque Converter (1)	Out of balance Internal failure Not sealed in crankshaft pilot
Transmission/Engine	Misaligned or missing dowels
Case Extension (19)	Output shaft support bushing is worn.
Turbine Shaft (502)	Worn surface of the stator shaft bushing
Mainshaft (662)	Worn bushing
Output Shaft (671)	Worn bushing
Bearing (668)	Worn