Parts for your 2017 Subaru Outback-Universal joints

2017 Subaru Outback universal joints: what they do and how to look after them

Universal joints are relevant to the 2017 Subaru Outback. The Subaru Factory Service Manual for 2015–2019 Outback/Legacy (Propeller Shaft section) and the Subaru parts catalogue for the propeller shaft assembly both show a two‑piece rear prop shaft with a centre support bearing and staked universal joints. The front and rear half‑shafts use CV joints, but the prop shaft uses U‑joints to transmit torque to the rear differential.

The universal joints on a 2017 Outback sit in the propeller shaft that runs down the middle of the car, linking the transmission to the rear diff. Their job is to let the shaft change angle while still spinning smoothly, coping with suspension travel and body movement. Because they pivot in multiple directions, they keep the all‑wheel drive feeling tight and predictable on rough roads, corrugations, and when towing the boat or caravan.

From the factory, the Outback’s U‑joints are sealed “staked” units, which means no grease nipples and no scheduled greasing. There’s nothing to lube during a routine service, but there is plenty to check. A good workshop will inspect the prop shaft for play, smooth articulation, and any rumbling from the centre bearing. If a U‑joint dries out or wears, it can cause vibrations through the cabin, a clunk when taking off or shifting from reverse to drive, or a chirp/squeak at low speed that changes with road speed.

If there’s noticeable play, binding, red dust around the bearing caps, or a vibration that shows up at 60–100 km/h and worsens under load, it’s time to act. Subaru’s official repair path is to replace the complete propeller shaft assembly because the original U‑joints are non‑serviceable. However, some reputable driveline specialists in Australia and New Zealand can rebuild the shaft with circlip‑type, greasable U‑joints and a new centre bearing, which can be a cost‑effective option.

Practical servicing tips owners should expect their mechanic to follow:

• Road test for driveline shudder or clunks on take‑off and overrun.
• Inspect prop shaft U‑joints and centre bearing every 20,000–30,000 km, especially if the car tows, is lifted, or sees beach/salt use.
• Check rear diff and transmission mounts, weak mounts can mimic U‑joint faults.
• If replacing the shaft, mark flanges to maintain balance and use new hardware torqued to spec.

Treat any emerging vibration early. Left to worsen, a failing U‑joint can damage the shaft, centre bearing, or even the diff. Keeping on top of it keeps the Outback quiet, smooth, and ready for the next long weekender.

Popular questions about 2017 Subaru Outback universal joints

Do the factory U‑joints on a 2017 Outback need regular greasing?

No. The OEM prop shaft uses sealed, staked U‑joints with no grease nipples, so there’s no routine greasing. Inspection during regular services is still important to catch wear early.

If you opt for an aftermarket or rebuilt shaft, you may get greasable circlip‑type U‑joints, which your mechanic can lube at service intervals.

How long do the U‑joints typically last?

On a well‑maintained, unmodified Outback, they often run 150,000–250,000 km. Lifespan shortens with heavy towing, lifted suspension angles, or beach driving and salt exposure.

Regular inspections, quick attention to vibrations, and avoiding deep water or corrosive conditions help them last longer.

Can the U‑joints be replaced without changing the whole prop shaft?

By Subaru’s book, the original staked U‑joints aren’t serviceable, so the specified fix is a complete propeller shaft replacement. That’s the straightforward dealer route.

Many driveline specialists can rebuild the shaft with serviceable U‑joints and a new centre bearing, which can be more affordable while still reliable when done properly.