Parts for your 2020 Subaru Legacy-Centre bearing

2020 Subaru Legacy centre-bearing: what it is, and when to sort it

Based on Subaru’s technical literature for the 2020 Legacy (BW platform) and the Propeller Shaft section of the Subaru Service Manual, plus the 2020 Subaru parts catalogue (Group 27 – Propeller Shaft), this model uses a two-piece tailshaft with an integral centre support bearing (also called a carrier bearing). Subaru supplies the centre-bearing as part of the complete propeller shaft assembly rather than as a stand‑alone service item.

On the 2020 Legacy’s constant‑AWD driveline, the centre-bearing supports the middle of the two-piece tailshaft, keeping the shaft true under load and across suspension movement. It cushions vibration via a rubber isolator and holds the shaft at the correct height so the universal/CV joints work at proper angles. When it’s healthy, the car feels smooth on take‑off and steady at highway speeds, when it’s tired, there’s shudder, rumble, or a droning that comes and goes with road speed.

There’s no fixed replacement interval in Subaru’s schedule, but it’s smart to have it inspected during routine servicing—especially from around 60,000 km onward or if the car tows, carries loads, or sees rough roads. A proper check includes looking for cracks in the rubber mount, loose bracket hardware, excessive tailshaft play, and any heat damage from nearby exhausts. Fasteners should be tightened to factory spec, and the shaft alignment marks preserved if it’s removed.

Typical warning signs include:

• A dull rumble between about 40–80 km/h that changes on and off throttle
• Shudder or vibration on take‑off or when climbing hills
• A thump or clunk on gear changes, or visible sag in the carrier rubber

When replacement’s needed, most workshops fit a complete genuine or quality remanufactured tailshaft because Subaru doesn’t usually sell the bearing on its own and the shaft is factory balanced as an assembly. Aftermarket carrier bearings do exist, but pressing the old one off and the new one on can upset balance if not done with the right jigs, so a full assembly is often the quicker, cleaner fix. The job involves removing shields, separating the rear flange, dropping the centre bracket, and sliding the shaft from the transmission output—then refitting with new hardware where specified, checking driveline angles, and road‑testing for NVH. Done right, the Legacy goes back to that quiet, tight AWD feel drivers expect.

Popular questions about the 2020 Subaru Legacy centre-bearing

How long does a centre-bearing usually last on a 2020 Legacy?
Service life varies with use and climate. Many run well past 150,000 km, but heat, age, towing, and rough roads can shorten that. Inspect it periodically and act on any noise or vibration before it takes out joints or mounts.

Can the centre-bearing be replaced on its own, or is a whole tailshaft needed?
Subaru commonly supplies the propeller shaft as a complete assembly with the bearing integrated. Some aftermarket carriers are available, but pressing and rebalancing require specialist gear. Many workshops opt for a full assembly to maintain balance and minimise comebacks.

What noises point to a failing centre-bearing versus tyres or wheel bearings?
A centre-bearing typically gives a low, speed‑related drone or a shudder on take‑off that eases once cruising. Wheel bearings tend to growl louder when loading that corner in a turn, and tyre noise usually changes with road surface rather than throttle. A technician can isolate it on a hoist or via a road test.