Parts for your 2019 Subaru Legacy-Centre bearing

Understanding the Centre Bearing in the 2019 Subaru Legacy

When it comes to the drivetrain setup of the 2019 Subaru Legacy, the question of whether a centre bearing is fitted is common. The Subaru Legacy, especially the 2019 model, features a unique all-wheel drive system known as Subaru's Symmetrical AWD. This system utilises a horizontally opposed "boxer" engine linked to a transmission that drives all four wheels without the need for a traditional driveshaft setup found in many rear-wheel or part-time AWD vehicles.

Because of this system design, the 2019 Subaru Legacy does not use a centre bearing. A centre bearing is typically found in vehicles with a two-piece driveshaft. It supports the intermediate section of the driveshaft, helping to maintain alignment and prevent excessive vibration as power travels from the transmission to the rear differential. This component becomes essential when the driveshaft is too long to be supported on its own, especially in rear-wheel drive or full-time four-wheel drive layouts with a longitudinal engine arrangement.

However, the 2019 Subaru Legacy uses a relatively compact and integrated drivetrain where the transmission and transfer case combination directs power to front and rear axles through shorter, independent half-shafts. This setup doesn't require a long driveshaft running the length of the vehicle, so there isn't an intermediate section that would need support from a centre bearing. Instead, the vehicle relies on robust CV joints and axle shafts designed to handle torque and allow for smooth power delivery, eliminating the need for a centre bearing.

Why is this different? Subaru's boxer engine design combined with its symmetrical all-wheel drive layout means the powertrain is balanced and compact. This naturally reduces vibration and drivetrain stress, common reasons why a centre bearing is necessary in other configurations. This layout also contributes to the Legacy's excellent handling and stability by lowering the centre of gravity and keeping weight evenly distributed.

For those curious, vehicles that commonly feature centre bearings include large SUVs or trucks with long two-piece driveshafts or some rear-wheel drive sedans and vans that require driveshaft support over greater distances. In those vehicles, the centre bearing prevents wobbling, reduces wear on the driveshaft, and contributes to smooth, vibration-free power transmission. Since the Subaru Legacy employs a different approach, the centre bearing is not relevant or fitted to this model.

Now, even though the centre bearing is absent on the 2019 Legacy, it's important to note that regular maintenance of the vehicle's drivetrain is still crucial. Subaru's AWD system relies heavily on well-maintained CV joints, differentials, and transmission components. If those parts wear out or suffer from lack of service, drivers will notice vibrations, noises, or even loss of power transmission.

When it comes to servicing the Subaru Legacy's drivetrain, the focus should be on regular inspection of the CV boots for cracks or tears. Damaged boots can lead to grease loss and dirt ingress, causing premature joint failure. Transmission and differential oils should be replaced according to Subaru's service schedule or sooner if conditions are harsh, to ensure smooth operation and prevent metal wear.

Also, checking for any abnormal vibrations or noises during driving will alert owners to potential issues before they turn into costly repairs. While not directly related to centre bearings, these inspections serve the same goal - maintaining drivetrain integrity and comfort.

In summary, the reason a centre bearing is not part of the 2019 Subaru Legacy's drivetrain boils down to its design. The Symmetrical AWD system paired with the boxer engine avoids the need for a two-piece driveshaft and therefore removes the requirement for an intermediate support bearing. This keeps the mechanical setup simpler, more compact, and capable of providing consistent power delivery with reduced traditional drivetrain vibration issues.

For Subaru Legacy drivers, understanding this helps steer maintenance efforts towards checking and servicing components that are actually used in the vehicle, keeping everything running smoothly and quietly for plenty of trouble-free driving.