Parts for your 2004 Mazda 6-Centre bearing

2004 Mazda 6 centre-bearing: is it actually a thing?

Short answer: a centre-bearing isn’t fitted to the typical 2004 Mazda 6 sold in Australia and New Zealand. Technical documentation backs this up. The Mazda Workshop Manual for GG/GY (2003–2005) under Driveline/Axle describes a front‑wheel‑drive layout with left and right driveshafts and no propeller shaft, so there’s no centre support bearing in the tailshaft to speak of. The Mazda Electronic Parts Catalog (GG, 2002–2007) lists no propeller shaft or centre-bearing for standard 4‑cyl or V6 front‑wheel‑drive variants by VIN. By contrast, the Mazda6 MPS (Mazdaspeed6, GG, 2005–2007) Workshop Manual in the AWD Propeller Shaft section does show a two‑piece shaft with a centre support bearing—different model and later years.

Why isn’t a centre-bearing used on the 2004 Mazda 6? Because it’s front‑wheel drive. Power goes from the transaxle straight to two short driveshafts. A centre-bearing is a tailshaft support used on rear‑wheel drive or all‑wheel drive setups with a long, two‑piece propeller shaft running down the tunnel. No prop shaft means nothing to support in the middle.

What can be confusing is the right‑hand (long) driveshaft on some FWD cars uses an intermediate “carrier” bearing mounted to the engine block. That’s not the same as a tailshaft centre-bearing. If someone’s chasing a mid‑car vibration or knock and thinking “centre-bearing”, they’re likely mixing terms.

There are a few exceptions worth noting. The turbo AWD Mazda6 MPS (2005–2007) does have a centre support bearing as part of its two‑piece prop shaft. Some overseas Atenza wagons had AWD too. But for a 2004 Mazda 6 sedan, hatch or wagon in AU/NZ spec, it’s FWD and doesn’t use a tailshaft centre-bearing.

If the car has shudders under load or a droning noise, it’s smart to check items that commonly mimic “centre-bearing” symptoms on a FWD Mazda 6:

• Inner and outer CV joints and split CV boots
• Right‑hand intermediate shaft support bearing play
• Tyre condition and balance, bent wheels
• Engine and transmission mounts collapsing

When in doubt, confirm the driveline type from the build plate or VIN. If it’s not an MPS or an AWD import, it won’t have a centre-bearing.

Popular questions

Does a 2004 Mazda 6 have a centre-bearing?
No. Standard AU/NZ 2004 Mazda 6 models are front‑wheel drive with no propeller shaft, so there’s no tailshaft centre-bearing. Only the later AWD Mazda6 MPS (2005–2007) and some overseas AWD variants use one.

I’m getting a vibration at 80–100 km/h—could it be the centre-bearing?
On a 2004 FWD Mazda 6, it won’t be a centre-bearing. Look to CV joints, the right‑hand intermediate shaft support bearing, wheel/tyre balance, or worn engine/trans mounts. A proper inspection on a hoist usually pinpoints it quickly.

Can the right‑hand intermediate “carrier” bearing be replaced separately?
Yes. It’s a pressed‑on support bearing for the long driveshaft. Replacement involves removing the shaft, pressing the old bearing off, and installing a quality new unit with correct alignment and torque. Many workshops do this as part of driveline noise or vibration repairs.