Parts for your 2018 Subaru Impreza-Universal joints

2018 Subaru Impreza universaljoints: what they do and when to service them

Yes, the 2018 Subaru Impreza uses universal joints (universaljoints) on its propeller shaft in Symmetrical AWD models. This is shown in Subaru’s 2018MY Impreza Service Manual (Driveline &, Axle – Propeller Shaft) and the Subaru parts catalogue, which list the two-piece propeller shaft with a centre support bearing and factory-staked U-joints. The front and rear half‑shafts use constant velocity (CV) joints, not U-joints, but the prop shaft relies on universaljoints to transmit drive to the rear differential at changing angles.

On this Impreza, the universaljoints allow the prop shaft to articulate as the driveline moves under load and suspension travel, keeping things smooth and quiet while the AWD system shuffles torque. They’re compact, tough, and designed to handle real-world Aussie and Kiwi conditions—everything from weekday commuting to corrugated backroads and wet winter runs.

From the factory these universaljoints are sealed and typically staked in, so there are no grease nipples and no routine lubrication required. During regular servicing it’s smart to check for play and roughness: with the car safely raised, a tech will hold the prop shaft near each joint and feel for looseness, binding, or a notchy movement. Any red flags mean it’s time to plan a replacement.

• Typical symptoms of worn universaljoints:
  • A clunk on take-off or shifting from reverse to drive
  • Vibration increasing with road speed (often felt through the floor)
  • Chirping or metallic squeak that changes with speed, not engine rpm
  • Rust-coloured dust around the bearing caps

Because the OE universaljoints on the 2018 Impreza are non-serviceable, Subaru procedure is to replace the propeller shaft assembly if a joint fails. Some driveline specialists can rebuild a shaft with serviceable U-joints, but OE-style replacement is the most straightforward. When fitting, keep shaft phasing correct, torque the flange bolts to spec, and inspect the centre support bearing and mounts while you’re there.

For local conditions, a quick driveline check every 20,000–30,000 km is a good habit, especially if the car sees coastal exposure, rough gravel, or lowered/raised suspension that changes driveline angles. If vibration or clunks appear, don’t ignore them—prompt attention protects the rear diff, transmission mounts, and bearings. Quality parts and proper torque go a long way to restoring that trademark Subaru smoothness.

Popular questions about 2018 Subaru Impreza universaljoints

Do all 2018 Subaru Imprezas have universaljoints?

In Australia and New Zealand the 2018 Impreza is sold as Symmetrical AWD, which uses a two-piece propeller shaft with universaljoints. Markets that offered FWD variants won’t have a prop shaft, so no driveline U-joints there—though they still use CV joints at the wheels. If it’s AWD, it has universaljoints on the prop shaft.

Can the universaljoints be greased or replaced on their own?

The factory universaljoints are sealed and staked, so there’s no greasing and Subaru’s service guidance is to replace the complete prop shaft assembly if a joint fails. Some driveline shops can rebuild the shaft with serviceable U-joints, but that’s a specialist job, most workshops fit a new or remanufactured shaft for reliability.

How do I tell a failing universaljoint from a bad CV joint?

A worn universaljoint usually causes speed-related vibration, a take-off clunk, or a rhythmic chirp from the tunnel area. A failing CV joint more often clicks on tight turns (front axles) or throws grease from a torn boot. Pinpointing the noise location and when it occurs helps a tech tell them apart quickly.