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In 2007, the Chevy Avalanche often faced transmission issues, especially with a tough 1-2 shift and engine bogging. Some drivers mentioned gear slipping and rough shifting. These problems are primarily due to a malfunctioning torque converter clutch. When the clutch doesn't work properly and the driver shifts gears, the engine can struggle after prolonged driving. These issues are the main transmission concerns with this model.
If you're experiencing transmission troubles in a 2007 Chevy Avalanche, you might encounter various issues like vibrations or unusual sounds while driving, a strange odor when the vehicle is running, difficulties shifting gears, a stuck or unresponsive shifter, and leakage of fluids. These problems could eventually result in a total transmission breakdown, essentially rendering the vehicle unusable.