2022 Subaru Outback — Transmission & Axle Gear Ratios

The 2022 Subaru Outback continues its legacy as a highly capable crossover that blurs the line between station wagon and SUV. Underpinning its symmetrical all-wheel-drive (AWD) system is a continuously variable transmission (CVT) and carefully selected axle ratios that maximize both fuel efficiency and off-road prowess. For the 2022 model year, the introduction of the Outback Wilderness trim brought significant changes to the driveline specifications to enhance low-speed climbing and towing capabilities.

Whether you are looking to upgrade your drivetrain, calculate towing limits, or diagnose a differential issue, understanding your vehicle's gear ratios is crucial. Read on for a complete breakdown of the 2022 Subaru Outback transmission and axle gear ratios.

Transmission gear ratios

The 2022 Subaru Outback exclusively utilizes Subaru’s Lineartronic Continuously Variable Transmission (CVT). Because it is a CVT, it does not have traditional physical gears. Instead, it uses a variable pulley system that provides an infinite number of ratios between its lowest and highest mechanical limits. However, Subaru programs these CVTs with an 8-speed manual mode to simulate traditional gear shifts.

There are two primary versions of the CVT used in the 2022 Outback: the TR580 (paired with the naturally aspirated 2.5L engine) and the High-Torque TR690 (paired with the 2.4L turbocharged engine). The Wilderness edition uses a specially tuned version of the TR690 for a lower final drive and improved low-end grunt.

Lineartronic CVT (2.5L Naturally Aspirated - TR580)

High-Torque Lineartronic CVT (2.4L Turbocharged XT models - TR690)

Note: The Outback Wilderness utilizes a modified TR690 CVT with an initial lower gear ratio of 4.066 for enhanced climbing ability on steep trails.

Available axle ratios

To complement the varying power outputs of the 2.5L and 2.4L engines, Subaru outfits the 2022 Outback with three distinct final drive/axle ratios. The standard trims prioritize fuel economy, the XT models require a beefier setup for torque management, and the Wilderness trim receives an aggressive ratio for off-roading.

How to identify your axle ratio

Unlike domestic trucks that use standard RPO codes inside the glove box, Subaru provides drivetrain identification directly on the vehicle's manufacturing plates. Here is how you can determine your 2022 Outback's exact transmission and axle ratio:

1. Check the B-Pillar / Door-Jamb Sticker: Open the driver's side front door and look for the vehicle identification placard on the B-pillar. This sticker contains a "Transmission Type" code (e.g., TR580 or TR690). You can match the transmission type and engine size to the ratios listed above.
2. Under-Hood VIN Plate: On many Subarus, the metal VIN plate riveted near the strut tower or on the firewall contains a specific "Option Code" or "Transmission Code" string.
3. Rear Differential Tag: If you are under the vehicle, look at the rear differential cover. Subaru often stamps or places a barcode sticker on the upper rear of the differential housing that indicates the gear set inside (such as "3.90" or a corresponding part number).
4. Use a VIN Decoder: The easiest way to verify your 2022 Outback's driveline configuration is by running the 17-digit VIN through a Subaru dealer parts portal or a reliable online VIN decoder.

Towing vs MPG impact

The relationship between your axle ratio, fuel economy, and towing capability is a matter of mechanical leverage.

Numerically Lower Ratios (e.g., 3.900): Found in the standard 2.5L Outbacks, this ratio is designed to keep engine RPMs low at highway speeds. This translates directly to superior fuel economy, allowing the 2.5L Outback to achieve up to 33 MPG on the highway. However, the downside is less low-end torque for towing (limited to 2,700 lbs) and slower acceleration.

Numerically Higher Ratios (e.g., 4.444): The Wilderness trim features the aggressive 4.444 final drive ratio. This provides exceptional mechanical leverage, multiplying engine torque at the wheels. It allows the Wilderness to crawl over rocks with ease and tow up to 3,500 lbs effortlessly. The trade-off is reduced fuel efficiency; the engine spins at higher RPMs on the highway, dropping the EPA rating to around 26 MPG highway.

Common issues

While the 2022 Subaru Outback drivetrain is generally robust, there are a few issues and quirks owners should be aware of regarding the differentials and CVT:

• CVT Chain Whine/Slip: Under heavy loads, especially if fluid maintenance has been neglected or towing limits exceeded, the CVT can develop a high-pitched whine or experience "judder" (slipping).
• Front Differential Leaks: The front differential shares space in the transaxle housing but utilizes its own separate gear oil. Axle seal leaks are a known quirk. If the gear oil drops too low, it can cause catastrophic failure to the front ring and pinion.
• Rear Differential Whine: A faint howling or whining from the rear of the vehicle at highway speeds can indicate incorrect ring and pinion backlash, or premature wear on the carrier bearings.
• Center Clutch Pack Wear: Subaru's Active Torque Split AWD relies on an electronically controlled multi-plate transfer clutch inside the tail shaft of the transmission. If mismatched tires are used (different tread depths), this clutch pack can bind and wear out prematurely, leading to a shudder when turning tightly.

Find a driveline shop on Repairius

Differentials, CVTs, and all-wheel-drive systems require precise tolerances and specialized fluids. If your Outback is experiencing gear whine, leaking differential seals, or you simply need a factory-scheduled CVT fluid service, do not leave it to chance. Find a driveline shop on Repairius to connect with trusted local experts who specialize in Subaru powertrains.