Parts for your 2020 Subaru Impreza-Universal joints

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

Yes, the 2020 Subaru Impreza uses universal joints. The AWD driveline runs a two‑piece propeller shaft with cross‑type U‑joints connecting the sections. Subaru’s 2020MY Impreza Service Manual (STIS, Drive Shaft System – Propeller Shaft) specifies sealed, non‑serviceable universal joints, and the Subaru parts catalogue lists the propeller shaft as a complete assembly with no separate U‑joint part numbers. Subaru’s EndWrench driveline training articles also note non‑greaseable, staked U‑joints on Subaru prop shafts. Together, those sources make it clear U‑joints are relevant and fitted on the 2020 Impreza.

On this model, the universal joints let the prop shaft transfer torque from the transmission to the rear differential while dealing with suspension movement and small alignment changes. They’re tough, run quietly, and, being sealed, don’t need routine greasing. That sealed design also means when a joint wears, the remedy is typically replacing the entire propeller shaft assembly rather than pressing in new joints.

For owners keeping on top of servicing, it’s smart to have a mechanic check the driveline at regular intervals (say, every 20,000–30,000 km or when it’s already on a hoist). While there’s no scheduled U‑joint lubrication, there are easy checks that help catch issues early:

• Listen for chirps, clunks on take‑off, or a low‑speed rumble that rises with road speed.
• Feel for vibration under load or on overrun at highway speeds.
• Inspect for rusty dust around the bearing caps, sling marks from failed seals, or looseness when the shaft is twisted by hand (vehicle safely supported, in neutral, wheels chocked).

If any of those symptoms show up, a driveline specialist or Subaru‑savvy workshop can confirm the fault. Because the Impreza’s U‑joints are staked and non‑serviceable per the factory manual, the usual fix is a complete prop shaft replacement, which also takes care of the centre support bearing in one go. Aftermarket rebuilds exist, but quality and balance are critical — poor work can introduce new vibrations. It’s worth using OE‑equivalent parts and ensuring the shaft is correctly phased and torqued during refit.

A couple of easy habits help U‑joints live a long life: avoid bending or prying on the shaft during other repairs, keep underbody protection intact to limit water and grit intrusion, and be cautious with ride‑height changes that can alter driveline angles. Treated well, the factory U‑joints typically run big kilometres without a peep.

• Does a 2020 Subaru Impreza have universal joints?
  Yes. The AWD system uses a two‑piece propeller shaft with sealed, non‑serviceable U‑joints. This is documented in the Subaru 2020MY Impreza Service Manual and supported by Subaru parts listings that don’t sell the U‑joints separately.
• Can the Impreza’s U‑joints be replaced on their own?
  From the factory, no — they’re staked and considered non‑serviceable. The standard repair is replacing the complete prop shaft assembly. Some driveline shops can rebuild shafts, but quality control and balance are critical.
• What are the signs a U‑joint is on the way out?
  Common tell‑tales include a chirp or clunk on take‑off, a steady vibration that follows road speed, or rust staining around the bearing caps. Any of these should prompt an inspection before longer trips.