Parts for your 2004 Subaru Impreza-Driveshafts

2004 Subaru Impreza Driveshafts: What They Do and How to Look After Them

Yes, the 2004 Subaru Impreza uses driveshafts. Subaru’s Symmetrical AWD platform fitted to Australian and New Zealand-market 2004 Imprezas uses front and rear CV driveshafts (half-shafts) and a propeller shaft (often called a tailshaft) to send power to all four wheels. This layout is detailed in the Subaru Factory Service Manual (2004 Impreza, Drivetrain/Front Axle and Propeller Shaft sections) and mirrored in common workshop references like the Haynes Repair Manual for Subaru Impreza 2002–2011 and Subaru’s parts catalogues.

On this model, each front and rear wheel is driven by a CV driveshaft with flexible joints that allow steering and suspension movement. A two-piece propeller shaft with a centre carrier bearing runs from the transmission to the rear differential. Together, these shafts keep torque flowing smoothly and help deliver the planted, sure-footed feel Subaru’s AWD is known for.

As part of regular servicing, it’s smart to give the driveshafts a once-over. Check CV boots for splits, weeping, or flung grease every service interval, a small split quickly lets grit in and destroys the joint. Spin the wheels by hand (safely, with the car raised correctly) and listen for clicking from the CVs, and look for play in the joints. Under the car, inspect the propeller shaft’s universal joints and the centre bearing for looseness, perishing, or vibration marks. Any clunks on take-off, shudder on acceleration, or clicking on tight turns usually means attention is due.

Replacement tips the pros follow:

• Address torn CV boots immediately, re-booting early can save the joint.
• Use quality shafts with heat-treated splines and fresh hardware, avoid mixing old and new nuts/pins.
• On removal, mark the propeller shaft flange orientation to maintain balance, refit in the same alignment.
• Always torque the axle nut to factory spec (check the FSM for your variant), incorrect torque can kill a new bearing or CV.
• After front CV work, check wheel bearing preload and re-road-test for vibration.

Service-wise, include driveline inspections at every scheduled service, and replace diff and transmission oils on time so the CVs and tailshaft aren’t stressed by binding or contamination. Technical coverage of these procedures appears in the Subaru Factory Service Manual (2004 Impreza Drivetrain) and is supported by the Subaru Technical Information System documentation used by workshops.

Popular questions about 2004 Subaru Impreza driveshafts

Are all 2004 Imprezas AWD and fitted with driveshafts?
In Australia and New Zealand, yes—AWD was standard, so the cars have front and rear CV driveshafts and a propeller shaft. Some overseas base models were FWD, but local-market 2004 cars are AWD-equipped.

What are the common signs my Impreza’s driveshafts need work?
Clicking on full lock, grease flung around a wheel arch, vibration on acceleration, or a clunk when selecting drive are the big giveaways. Any torn CV boot or noticeable play at a joint means it’s time for repair or replacement.

Do WRX/STI driveshafts differ from non-turbo models?
Yes, many WRX/STI variants use heavier-duty shafts and different spline counts or lengths. Always match parts to your VIN or transmission code and check the factory parts listings before ordering.