Parts for your 2011 Subaru Impreza-Universal joints

2011 Subaru Impreza universal joints (U-joints): what they do and when to replace them

Universal joints are indeed used on the 2011 Subaru Impreza. Technical sources including the Subaru Service Manual (STIS) for the 2011 Impreza (Propeller Shaft section), the Subaru Electronic Parts Catalogue for the 2011 model year, and the Haynes Repair Manual for Subaru Impreza 2008–2014 all describe a two-piece propeller shaft with sealed, non-disassemblable U-joints and a centre support bearing. These U-joints are part of the all-wheel drive driveline, while the front and rear drive axles use constant-velocity (CV) joints.

On a 2011 Impreza, the universal joints sit in the propeller shaft linking the transmission to the rear differential. Their job is to let the shaft transmit torque smoothly even as the angles change with body movement and suspension travel. That flexibility keeps the driveline quiet and happy under load, on the motorway, and when pottering around town.

Because Subaru fitted sealed, factory-staked U-joints, there’s no greasing zerk and no normal service interval. The smart play is inspection during routine servicing, especially once the car’s clocked up 100,000 km or if it’s used on corrugated roads or near the coast. Look and listen for tell-tales like a chirp or squeak at low speed, a shudder on take-off, a clunk shifting between reverse and drive, or a buzz through the floor at 60–80 km/h. Any red dust around the bearing caps or noticeable free play at the yokes is a bad sign.

If wear is confirmed, Subaru’s service literature specifies replacement of the propeller shaft as an assembly because the U-joints and centre bearing aren’t meant to be disassembled. Many driveline specialists in Australia and New Zealand can rebuild and balance the shaft with quality replacement joints, but it’s critical the phasing is correct and the shaft is dynamically balanced. When refitting, mark flange orientations, use the correct hardware, and check the centre bearing rubber for cracks. After the job, a road test under light and moderate load helps confirm the vibration is gone.

Left too long, a failing U-joint can flog out the centre bearing, stress the rear diff pinion, and send nasty vibrations through the cabin. Sorting it promptly keeps the Impreza’s AWD feel tight and tidy, just as it should be.

• Common symptoms: squeak at low speed, clunk on load change, take-off shudder, highway vibration.
• Service note: factory U-joints are sealed, replace prop shaft assembly or have it professionally rebuilt and balanced.

Does a 2011 Subaru Impreza use U-joints or only CV joints?
It uses both. The front and rear drive axles use CV joints, while the propeller shaft running down the centre to the rear differential uses universal joints. That’s why U-joints are directly relevant to this model’s AWD driveline.

Can the Impreza’s U-joints be greased or replaced individually?
From the factory, no. Subaru specifies sealed, non-disassemblable U-joints on the prop shaft and recommends replacing the shaft as an assembly if there’s play or noise. A driveline specialist can often rebuild the shaft with new joints and then balance it, which many owners choose as a cost-effective option.

When should the U-joints be checked?
They don’t have a set replacement interval, but it’s wise to have them inspected during regular servicing from around 100,000 km, or sooner if there’s vibration, clunking, or squeaking. Cars regularly driven on rough roads or through water benefit from more frequent checks.