Parts for your 2020 Subaru Impreza-Universal joints

2020 Subaru Impreza universal joints: what they do and how to look after them

Based on Subaru’s factory Service Manual for the 2017–2021 Impreza (Driveline & Differential section) and the OEM parts catalogue for the AWD propeller shaft assembly, the 2020 Subaru Impreza does use universal joints. They’re fitted on the two-piece propeller shaft that runs between the transmission and the rear differential. The front and rear drive shafts to the wheels use constant-velocity (CV) joints, not universal joints, which is why some owners get mixed messages when hunting for “U-joints” versus “CVs.” Subaru’s documentation also notes the propeller shaft U-joints are staked/non-serviceable, meaning they’re part of the shaft assembly from factory.

On the 2020 Impreza, universal joints allow the prop shaft to transmit drive while the suspension moves and the drivetrain angles change. They work alongside a centre support bearing to keep the shaft running true. When healthy, they’re quiet and smooth, when worn, they can cause shudder, vibration under load, or a clicking/clunk on take-off.

Servicing is largely about inspection because the OE U-joints aren’t designed to be greased or replaced on their own. During routine servicing (say every 20,000–30,000 km in Aussie and Kiwi conditions), a tech should check for:

• Free play or binding in the propeller shaft joints
• Rust staining or fretting around the bearing cups
• Vibration on road test that changes with speed or throttle
• Condition of the centre support bearing and its rubber mount

If any play or roughness is found, the recommended path per Subaru procedures is to replace the complete propeller shaft assembly. Some driveline specialists can rebuild staked U-joints, but it’s a precision job and not endorsed by the factory. When replacing, torque the flange bolts to spec, align the shaft marks, and keep the balance weights intact—small mistakes here can create new vibrations.

Drivers who tow occasionally or do lots of motorway kilometres don’t usually need extra attention beyond routine checks. However, vehicles that see dusty roads, road-salt exposure, or frequent short trips benefit from more frequent inspections. If there’s a vibration that feels like it’s coming from under the centre of the car, gets worse under acceleration, or a dull clunk as the driveline takes up, it’s worth booking a diagnostic before it snowballs into collateral wear on the differential mounts or transmission output.

Bottom line: the 2020 Impreza does have universal joints on the prop shaft, they’re there to keep the AWD system smooth and dependable, and while they’re not a grease-and-go item, regular checks mean fewer surprises and a quieter commute.

Popular questions about 2020 Subaru Impreza universal joints

Does a 2020 Subaru Impreza have universal joints or only CV joints?

It has both: CV joints on the front and rear half-shafts to the wheels, and universal joints on the propeller shaft between the transmission and rear diff. That mix is exactly how Subaru’s Symmetrical AWD keeps things smooth while handling different angles and suspension movement.

The factory Service Manual and parts catalogue list the propeller shaft as a two-piece unit with U-joints and a centre support bearing.

How often should the universal joints be checked?

They’re not a regular replacement item, but it’s smart to have them inspected during routine servicing (roughly every 20,000–30,000 km) or any time there’s a driveline vibration, clunk, or shudder. A road test plus a check for play at the flanges goes a long way.

Harsh conditions—gravel, coastal salt, or lots of stop–start—justify more frequent checks.

Can the Impreza’s U-joints be replaced on their own?

From factory, the U-joints are staked and considered non-serviceable, so the official fix is replacing the complete propeller shaft. That ensures correct balance and longevity.

Some driveline specialists can rebuild them, but it’s not a DIY gig and may not match OEM durability without proper parts and balancing.