Parts for your 2009 Subaru Legacy-Centre bearing

Centre Bearing and the 2009 Subaru Legacy: What You Need to Know

The 2009 Subaru Legacy is a popular midsize sedan and wagon that comes with Subaru's signature all-wheel-drive system. If you're sorting out parts or looking under the car for maintenance, you might ask whether the 2009 Legacy has a centre bearing in its drivetrain. The quick answer is that a centre bearing is not used on this vehicle. Let's take a closer look at why that is, and what that means for the Legacy's drivetrain setup.

First off, a centre bearing is typically found in vehicles that have a two-piece or multi-piece driveshaft. It supports the intermediate shaft section, helping reduce vibrations and keeping the shaft aligned as it spins at high speeds. On rear-wheel-drive and four-wheel-drive cars that have a long driveshaft, the driveshaft is often split into two sections for packaging reasons. In these setups, the centre bearing sits between the transmission and rear differential, supporting the driveshaft in the middle. It absorbs loads, prevents excessive movement, and maintains smooth power delivery.

Now, the 2009 Subaru Legacy uses a boxer engine combined with Subaru's symmetrical all-wheel-drive system, which is a bit different from many other AWD setups. The key thing here is that the Legacy's drivetrain layout utilises a transaxle design. In this system, the transmission and differential are combined into one unit that sits right at the front of the vehicle, sending power both to the front wheels and the rear wheels through relatively short driveshafts. Because the shaft lengths going to the rear wheels are much shorter, and because the transmission and differential are integrated, the need for a long, multi-section driveshaft is eliminated.

This layout means that there's no lengthy driveshaft running the length of the vehicle requiring intermediate support by a centre bearing. Instead, Subaru uses shorter half-shafts with constant velocity (CV) joints that feed power directly to the wheels. These shafts have their own set of bearings and joints designed for flexibility and smooth operation without the need for a central bearing to keep them stable.

Because the 2009 Legacy does not have a multi-piece driveshaft setup, it does not feature a centre bearing at all. So if you've been hunting around for a "centre bearing" part for your Legacy, you won't find one because it simply is not part of the driveline architecture.

That said, while the centre bearing may not be relevant here, the Legacy's drivetrain definitely requires regular checks and maintenance - just on other components. Those short half-shafts with their CV joints are crucial, and over time the CV boots can crack or degrade, leading to grease loss and joint wear. Common signs of wear include clicking noises when turning, vibrations, or grease splattered around the wheel arch.

It's always a good idea to have your Subaru's driveshaft boots inspected during servicing. If a CV boot is damaged, replacing it quickly is essential to avoid more expensive CV joint failure. While you won't be dealing with centre bearings, keeping the half-shafts in good nick will ensure smooth power delivery and avoid breakdowns.

Regular servicing also includes checking the transmission fluid condition and level, since the transaxle is a combined unit handling transmission and differential duties. A smooth running transaxle reduces stress on the drivetrain components, including the half-shafts.

So, for the 2009 Subaru Legacy owner, the takeaway is this: a centre bearing is simply not applicable due to the vehicle's drivetrain design. Instead, focus your attention on maintaining the CV joints and half-shafts, along with your regular servicing schedule. Keeping those parts in tip-top shape not only maximises the Legacy's renowned all-wheel-drive performance but also ensures that your drives are smooth and trouble-free for years to come.