What is the gear ratio for a 2013 Avalanche?
The rear axle (final drive) ratio for most 2013 Chevrolet Avalanches is 3.42:1, with 3.73:1 available on certain configurations. The transmission in this year is a 6-speed automatic (GM 6L80) with a standard set of internal gear ratios.
In this article, we break down the two main gear-ratio components that enthusiasts and owners commonly reference on the 2013 Avalanche: the transmission’s gear ratios and the rear axle final-drive ratio. Exact numbers can vary by trim and option package, so checking the vehicle’s door sticker or build sheet is the best way to confirm for a specific truck.
Transmission gear ratios (GM 6L80 six-speed automatic)
Below are the primary gear ratios used in the 6L80 transmission that was paired with the 2013 Avalanche. These internal ratios determine how the engine’s power is distributed across the six gears.
- 1st gear: 4.03
- 2nd gear: 2.36
- 3rd gear: 1.53
- 4th gear: 1.15
- 5th gear: 0.85
- 6th gear: 0.67
Understanding these ratios helps explain acceleration characteristics and highway fuel economy, as each gear keeps the engine within its optimal power range for a given speed and load.
Rear axle (final-drive) ratios
The final-drive ratio is the gear reduction between the driveshaft and the wheels, influencing towing ability and efficiency. For the 2013 Avalanche, the common configurations are as follows.
- Standard rear axle ratio: 3.42:1
- Optional on some models: 3.73:1 (typically associated with certain 4x4 or towing-oriented builds)
Because the axle ratio affects acceleration, cruising RPM, and towing performance, exact values can differ by market, model year changes, and specific factory options. Always verify the exact axle ratio on the vehicle you’re inspecting using the door-jamb sticker or the GM build sheet.
Summary
For the 2013 Chevrolet Avalanche, the most common gear-ratio references are a 3.42:1 rear axle (final drive) and a GM 6L80 six-speed automatic with the internal ratios listed above. An optional 3.73:1 rear axle was available on some configurations. To determine the precise figures for a particular truck, check the vehicle’s documentation or a VIN-specific build sheet.
