Section 1004 (Automatic Transmission - 4L80-E/4L85-E (Troubleshooting)): Troubleshooting: Noise

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Noise

Checks	Cause
Torque Converter (1)	Loose lug bolts Out of balance Internal failure
Transmission/Engine	Misaligned
Case Extension (19)	Output shaft support bushing is worn.
Reaction and Output Gear Sets	Flats on gear teeth or teeth improperly machined
Oil Pan	Dented