Noise in Second or Sixth Gear

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Center Support with 2-6 Low and Reverse Clutch Assembly (67)	Inspect for damaged or worn output carrier outer sun gear shaft front bushing (458). Inspect for damaged or worn output carrier outer sun gear shaft rear bushing (460). Inspect for damaged 2-6 clutch backing plate (451). Inspect for worn splines on backing plate. Inspect for damaged 2-6 clutch backing plate retaining ring (450). Inspect for damaged 2-6 clutch piston assembly (457), spring (456), retaining ring (455), and center support assembly (459).

Checks

Causes

Center Support with 2-6 Low and Reverse Clutch Assembly (67)

Inspect for damaged or worn output carrier outer sun gear shaft front bushing (458).
Inspect for damaged or worn output carrier outer sun gear shaft rear bushing (460).
Inspect for damaged 2-6 clutch backing plate (451). Inspect for worn splines on backing plate.
Inspect for damaged 2-6 clutch backing plate retaining ring (450).
Inspect for damaged 2-6 clutch piston assembly (457), spring (456), retaining ring (455), and center support assembly (459).