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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1312 (Automatic Transmission - 6L80/6L90 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information And Procedures >> No First, Second, Sixth, or Reverse Gear

No First, Second, Sixth, or Reverse Gear

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Checks Causes
Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)
  • Inspect for a damaged center support assembly (459).
  • Inspect for worn or damaged output carrier outer sun gear shaft front and rear bushing (458 and 460).
Center Support Retaining Ring (66) Inspect for damage.
Output Carrier Assembly (68) Inspect for a worn or damaged center support roller bearing assembly (485).
2-6 and 3-5-R Clutch Hub Thrust Bearing Assembly (65) Inspect the bearing for wear or damage.
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