Parts for your 2023 Subaru Impreza-Universal joints

2023 Subaru Impreza universal-joints: what they do and how to look after them

Based on the Subaru Service Manual for MY2017–MY2023 Impreza (Driveline/Axle – Propeller Shaft) and Subaru parts catalogue notes, the 2023 Subaru Impreza with Symmetrical All‑Wheel Drive uses universal joints as part of its propeller shaft assembly. These U‑joints are factory‑staked, sealed, and not serviced separately, if worn, Subaru specifies replacing the complete propeller shaft assembly. Front and rear drive axles use constant‑velocity (CV) joints, while the U‑joints live on the prop shaft that sends torque to the rear differential.

On the 2023 Impreza, universal joints let the propeller shaft transmit power at changing angles as the body and drivetrain move over bumps or under load. They keep the driveline smooth and connected between the transmission and rear diff, which is critical for Subaru’s always‑on AWD feel. Because they’re sealed, there’s no greasing to do, the focus is on inspection and timely replacement if wear shows up.

For regular servicing, a workshop will usually check the prop shaft for free play at the flanges, smooth rotation, and any binding. They’ll also look over the centre support bearing and mounts. Common early warnings of a tired U‑joint include a light squeak at low speed, a clunk when shifting between reverse and drive, or a vibration that shows up at highway speeds and changes with throttle. Any rust dust around the bearing caps can also hint at internal wear.

If a U‑joint is worn, Subaru’s technical guidance is to replace the propeller shaft as one piece rather than pressing in a new joint. That helps preserve balance and phasing, which keeps the AWD system quiet and vibration‑free. During replacement, techs mark flange positions, support the exhaust and heat shields, drop the centre bearing, and torque new flange hardware to spec. After fitment, a road test checks for any residual vibration. For Aussie and Kiwi conditions—think corrugations, boat ramps, and city stop‑start—adding a driveline inspection at major services (or around every 20,000–30,000 km) is a smart move.

Left alone, a failing U‑joint can take out the centre bearing or damage the diff pinion seal, so catching it early saves dollars. If there’s any shake, shudder, or clunk from underneath, it’s worth booking an inspection before the next big trip.

• Typical symptoms: squeak at low speed, clunk on take‑off, highway vibration.
• Service action: inspect for play/binding, replace complete prop shaft if worn.
• Note: U‑joints are sealed, non‑greasable, and not sold separately by Subaru.

Popular questions

Does the 2023 Subaru Impreza have universal joints?
Yes. On AWD models (standard in AU/NZ), the propeller shaft uses sealed universal joints. The wheel drive shafts use CV joints, so both joint types are present in the car’s driveline.

Can the Impreza’s U‑joints be greased or replaced on their own?
No. Factory guidance and parts listings show the U‑joints are integral to the prop shaft and non‑serviceable. If there’s play or binding, the correct repair is replacing the complete propeller shaft assembly.

What are the signs a U‑joint needs attention on a 2023 Impreza?
Listen for a chirp or squeak at low speed, feel for a clunk when selecting drive or reverse, or watch for a vibration that appears at 60–100 km/h and changes with load. Any of these warrant a driveline inspection.