Parts for your 2007 Subaru Impreza-Universal joints

2007 Subaru Impreza universal joints – what they do and how to look after them

According to the Subaru Factory Service Manual for the 2007 model year Impreza/WRX/STI (Drive Shaft/Propeller Shaft section) and Subaru’s electronic parts catalogue, the 2007 Subaru Impreza uses universal joints (U-joints) on its two-piece propeller shaft that sends drive to the rear differential. The front and rear drive axles use constant-velocity (CV) joints, but the prop shaft itself relies on sealed, non-greaseable U-joints and a centre support bearing. The Subaru manual specifies the propeller shaft as a non-serviceable assembly: if a U-joint is worn, the complete shaft is replaced, or it’s professionally rebuilt by a driveline specialist.

On a 2007 Subaru Impreza, the universal joints keep the prop shaft spinning smoothly while the suspension moves and the driveline angles change. They let the AWD system do its thing without binding or vibration. From factory, the U-joints are sealed, so there’s no routine greasing point — which is great for low maintenance, but it also means that once wear sets in, the fix is replacement rather than a quick lube.

As part of regular servicing, it’s smart to give the prop shaft a once-over every 20,000–40,000 kilometres, especially if the car tows, does long highway runs, or sees rough roads. A tech will check for play at the U-joints, inspect the centre bearing, and look for rusty dust around the joint caps (a giveaway that needle bearings are on the way out). On-road symptoms worth noting:

• Shudder or vibration under load or at certain speeds
• Clunk when selecting drive or on throttle tip-in
• Chirping/squeaking that changes with road speed

If any of that sounds familiar, don’t let it ride. A failing U-joint can escalate into a nasty vibration that takes out the centre bearing or damages the diff flange. Because the OE joints are staked in, the Subaru service approach is replacing the propeller shaft assembly. Many owners in Australia and New Zealand opt to have a driveline shop rebuild the shaft with serviceable, clip-retained U-joints, which makes future maintenance easier and can be kinder on the wallet. Either way, use quality parts, torque the flange bolts correctly, and road-test for vibrations. If the car’s lifted or lowered, consider checking driveline angles — a small spacer or adjustment can help minimise joint stress and vibration.

Popular questions about 2007 Subaru Impreza universal joints

Do all 2007 Subaru Imprezas have U-joints?

Yes. Every 2007 Impreza with Subaru’s AWD has a two-piece propeller shaft with universal joints and a centre support bearing. The wheel axles use CV joints, which are different parts. The U-joints are sealed from factory and aren’t designed to be greased.

Can the U-joints be replaced on their own, or do I need a whole new prop shaft?

From Subaru’s standpoint, the prop shaft is a non-serviceable assembly, so they recommend replacing it complete. However, in Aus/NZ it’s common for a driveline specialist to rebuild the original shaft with serviceable U-joints, which is a perfectly good solution if done properly.

What are the tell-tale signs my Impreza’s U-joints are on the way out?

Look for a driveline shudder on take-off, a speed-related vibration, a clunk as you go on/off throttle, or a squeak/chirp that follows road speed. Any free play when twisting the prop shaft by hand with the car safely raised is another red flag that the joint needles are worn.