2019 Subaru Outback Transmission & Axle Gear Ratios

Transmission gear ratios

The 2019 Subaru Outback is exclusively equipped with a Lineartronic Continuously Variable Transmission (CVT). While CVTs don't have traditional "gears" in the same way a conventional automatic or manual transmission does, they operate within a range of ratios to simulate gear changes for performance and fuel economy. Subaru provides simulated steps for the CVT, giving the impression of distinct gears.

Here are the simulated gear ratios for the 2019 Subaru Outback's Lineartronic CVT:

Available axle ratios

The 2019 Subaru Outback utilizes a single final drive (axle) ratio across all trims and engine configurations. This simplifies identification and parts sourcing. Subaru's Symmetrical All-Wheel Drive system integrates seamlessly with this standardized ratio.

How to identify your axle ratio

For the 2019 Subaru Outback, identifying your axle ratio is straightforward as all models come with a 3.900 ratio. However, for future reference or if you own a different Subaru model, here's how you would typically find this information for other vehicles:

• Subaru (Generally): For many Subaru models, the final drive ratio is often listed on a sticker under the hood, on the door jamb, or sometimes within the owner's manual specifications. The VIN decoder can also be a reliable source for factory specifications. There isn't a specific RPO code to look for in the same way GM vehicles have, as the ratio is often tied directly to the transmission type and engine for a given model year.

• General Motors (GM): Look for a white RPO (Regular Production Option) sticker in the glove compartment, on the door jamb, or occasionally under the rear cargo area. Axle codes typically start with a "G" (e.g., GU4 for 3.08, GT5 for 4.10).

• Ford/Ram: For many Ford and Ram trucks and SUVs, the axle ratio is often stamped on a metal tag attached to one of the differential cover bolts. You may need to clean it off to read clearly. Alternatively, the door jamb sticker might have an "AXLE" code that can be decoded with an online Ford/Ram VIN decoder.

• VIN Decoder: Many online VIN decoders can provide your vehicle's original build specifications, including the axle ratio. This is often the easiest and most reliable method if you have your VIN handy.

Towing vs MPG impact

Axle ratios play a significant role in balancing a vehicle's towing capacity and fuel economy. For the 2019 Subaru Outback, with its single 3.900 ratio, Subaru has chosen a balanced approach suitable for its intended use.

• Numerically Lower Ratio (e.g., 3.08, 3.23): This means the driveshaft spins fewer times for every one rotation of the wheel. This reduces engine RPMs at cruising speeds, leading to better fuel economy on the highway. However, it also means the engine has to work harder to get the vehicle moving or to pull heavy loads, which can decrease towing performance.

• Numerically Higher Ratio (e.g., 3.73, 4.10): This means the driveshaft spins more times for every one rotation of the wheel. This increases engine RPMs at any given speed, providing more torque multiplication at the wheels. This is beneficial for towing heavy loads, off-roading, or accelerating quickly. The downside is typically a reduction in highway fuel economy due to the higher engine speeds.

Subaru's 3.900 final drive ratio for the Outback provides a good compromise, offering ample torque for the vehicle's towing capacity while maintaining respectable fuel efficiency, especially when paired with the efficiency of the Lineartronic CVT.

Common issues

While the Subaru Outback's driveline is generally robust, certain components can experience wear or issues over time, similar to other vehicles.

• Ring & Pinion Whine: This often indicates wear on the gear teeth or improper setup (backlash, pre-load) of the ring and pinion gears within the differential. A high-pitched whine that changes with vehicle speed (and sometimes load) is a common symptom. Though less common on newer models with precise manufacturing, it can occur if maintenance is neglected or if the vehicle has been subjected to extreme use.

• Carrier Bearing Issues: The carrier bearings support the differential carrier assembly. If these bearings wear out, they can produce a humming, rumbling, or growling noise, particularly noticeable at certain speeds or when turning. Ignoring this can lead to further damage to the differential.

• Limited-Slip Clutch Wear (if applicable): While not all Outbacks will have a traditional clutch-type limited-slip differential (many use open differentials with electronic traction control or viscous limited-slip), if equipped, the clutches can wear out over time. Symptoms might include shuddering or chattering when turning tightly at low speeds, or a decreased ability to transfer power effectively to a slipping wheel.

Regular differential fluid changes (especially if towing or driving in harsh conditions) are crucial for prolonging the life of these components.

Find a driveline shop on Repairius.