GM Genuine Parts Automatic Transmission Main Shafts are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These shafts interact with the gears and clutches of your vehicle's transmission. Those gears turn relative to the main shaft except when engaged by the clutches. The relationship between these components allows for various combinations using clutch packs and gears connected in a variety of ways, which provides different forward and reverse speeds. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

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• Helps prevent harsh shifting
• Regulates the gear ratio according to demand
• Alters the output of the transmission
• Helps provide smooth shifting at various throttle positions
• Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
• GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
• GM engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
• GM regularly updates production and service part designs to integrate new materials and technologies