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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1355 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Description And Operation >> Transmission Component and System Description >> Gear Sets

Gear Sets

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.

The planetary gear train includes 3 constant-mesh planetary gear sets containing high-helix gears. By the engagement of the clutches in various combinations, the planetary sets act singly or together to provide 6 forward ranges, NEUTRAL, and REVERSE.

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