2015 Subaru Crosstrek Transmission & Axle Gear Ratios

Transmission gear ratios

The 2015 Subaru Crosstrek was offered with two transmission options: a 5-speed manual transmission and a Lineartronic Continuously Variable Transmission (CVT).

5-Speed Manual Transmission

Lineartronic CVT (TR580)

Available axle ratios

The 2015 Subaru Crosstrek came with different axle ratios depending on the transmission and trim level.

How to identify your axle ratio

Identifying the axle ratio on a 2015 Subaru Crosstrek is not as straightforward as with some other manufacturers that use RPO codes on door jambs or axle tags. Subaru typically integrates the final drive ratio into the transmission and a specific axle code isn't readily available on a sticker. However, you can often determine your axle ratio by:

• Owner's Manual: Your vehicle's owner's manual will often list the specifications, including the final drive ratio for your specific configuration.
• VIN Decoder: Using an online VIN decoder or contacting a Subaru dealership with your VIN can often provide detailed specifications of your vehicle, including the axle ratio.
• Transmission Code: The transmission model number (e.g., TR580 for the CVT) can sometimes be cross-referenced with Subaru documentation to determine the associated final drive ratio.

Towing vs MPG impact

Numerically Lower Ratio (e.g., 3.700): A numerically lower axle ratio means the engine will operate at lower RPMs at a given road speed. This generally translates to better fuel economy, as the engine isn't working as hard. However, it also means less torque multiplication at the wheels, which can reduce towing capacity and acceleration performance.

Numerically Higher Ratio (e.g., 4.444): A numerically higher axle ratio means the engine will operate at higher RPMs at a given road speed. This provides greater torque multiplication at the wheels, resulting in improved acceleration and increased towing capacity. The trade-off is typically lower fuel economy due to the higher engine speeds.

For the 2015 Subaru Crosstrek, the 3.700 ratio paired with the CVT is optimized for a balance of fuel economy and everyday driving, consistent with the Crosstrek's intended use as a compact crossover. The 4.444 ratio with the manual transmission offers a bit more spirited acceleration and capability, often preferred by those who enjoy more engaging driving or occasionally tackle light off-road trails.

Common issues

Subaru drivetrains, especially those found in the Crosstrek, are generally known for their reliability. However, like any mechanical component, they can experience issues over time. Specific to gear ratios and axles, common issues are less about the ratio itself and more about the components. While not widespread problems, some owners might encounter:

• Carrier Bearing Wear: The carrier bearings support the differential within the axle housing. Wear can lead to a humming or whirring noise that changes with vehicle speed.
• Limited-Slip Clutch Wear (if applicable): If equipped with a limited-slip differential (which is less common for the Crosstrek's front and rear differentials, which are typically open or have electronic traction control), the clutches can wear out, leading to a loss of limited-slip function and sometimes clunking noises during turns.

It is important to note that these issues are not endemic to the 2015 Crosstrek and are generally seen in higher mileage vehicles or those subjected to particularly harsh use.

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