2016 Tesla Model X Transmission & Axle Gear Ratios

Transmission gear ratios

The 2016 Tesla Model X, being an all-electric vehicle, does not use a multi-speed transmission in the traditional sense. Instead, it utilizes a single-speed direct drive system for both the front and rear motors. This design simplifies the drivetrain and efficiently delivers power to the wheels. Therefore, there are no "gears" in the conventional understanding for 1st, 2nd, 3rd, etc., or reverse, as you would find in an internal combustion engine vehicle.

Available axle ratios

The Tesla Model X uses fixed-ratio differentials for each motor. These ratios are integral to the motor and differential assembly and are not typically user-selectable or variable like with traditional internal combustion engine vehicles offering different axle ratios based on trim or package. For the 2016 Model X, the final drive ratio is approximately 9.347:1 for both the front and rear electric motors. It's important to note that Tesla doesn't publicly list these as "axle ratios" in the same way conventional manufacturers do, but rather as a key component of their drivetrain design.

How to identify your axle ratio

For a 2016 Tesla Model X, identifying the "axle ratio" isn't done through RPO stickers, axle tags, or VIN decoders in the same way as gasoline-powered vehicles. Since it’s an electric vehicle with a fixed-ratio direct drive system for its motors, there isn't a range of ratios to identify. The final drive ratio is consistent across all variants of the 2016 Model X. Tesla vehicles typically provide comprehensive information through their touchscreen interface regarding various vehicle specifications, but the final drive ratio is a fixed engineering parameter rather than a user-identifiable option.

Towing vs MPG impact

Discussion of "towing vs MPG impact" in the traditional sense, related to numerically lower or higher axle ratios, doesn't directly apply to the 2016 Tesla Model X. As an all-electric vehicle, it does not consume gasoline and therefore doesn't have an "MPG" rating. Its efficiency is measured in MPGe (Miles Per Gallon equivalent) or Wh/mile (Watt-hours per mile). The fixed gear ratio is optimized by Tesla for a balance of acceleration, top speed, and energy efficiency, inherent to its electric powertrain.

While higher numerical ratios in internal combustion engine vehicles generally improve towing capacity at the expense of fuel economy, and lower numerical ratios improve fuel economy at the expense of towing, the Tesla Model X's electric motors provide instant torque across a wide RPM range. This characteristic, combined with the single-speed reduction gear, is designed to deliver both impressive towing capabilities (with the optional towing package) and excellent energy efficiency without the need for multiple gear ratios.

Ultimately, the impact on efficiency when towing is more related to the increased energy consumption due to the additional load and aerodynamic drag, rather than a selectable axle ratio.

Common issues

Unlike traditional differentials in internal combustion engine vehicles, the electric drive units in the Tesla Model X are largely sealed and designed for the vehicle