Parts for your 2005 Mazda 6-Centre bearing

2005 Mazda 6 centre-bearing — is it actually used?

Based on factory documentation and parts listings, a centre-bearing (centre support bearing) is not used on the standard 2005 Mazda 6 (GG/GY) front‑wheel drive models. These cars don’t have a propeller shaft running to a rear differential, so there’s no need for a centre-bearing in the driveline. A centre-bearing does apply only to the all‑wheel drive turbo model, known as the Mazda 6 MPS (Mazdaspeed6 in some markets), which uses a two‑piece propeller shaft with a rubber‑mounted centre support.

Technical sources consulted:

• Mazda 6 (GG/GY) Workshop Manual, Front Axle – Drive Shaft (2WD models): details left/right CV drive shafts only, no propeller shaft or centre support bearing.
• Mazda Electronic Parts Catalogue (EPC) for 2005 GG/GY: no centre support bearing listed for 2WD, a centre support appears only under Propeller Shaft for the Mazda 6 MPS/AWD.
• Mazda 6 MPS/Mazdaspeed6 Workshop Manual, Propeller Shaft section: specifies a two‑piece shaft with a centre support bearing and mounting bracket.

Why it’s not used on most 2005 Mazda 6 models: the regular GG/GY cars are front‑wheel drive, with the transaxle driving two short front CV shafts. There’s no long, multi‑piece shaft to the rear, so a centre-bearing isn’t required. Some owners may hear “centre-bearing” used loosely to describe the right‑hand intermediate (carrier) bearing on the passenger‑side axle of certain FWD setups, but that’s a different part and function altogether.

If the vehicle is the Mazda 6 MPS (AWD), then yes, it does have a centre-bearing supporting the propeller shaft. For everyone else in a standard 2005 Mazda 6, a centre-bearing isn’t a relevant service item because the car simply doesn’t have one. Unsure which you’ve got? If it’s turbocharged, AWD, and usually a 6‑speed manual with a rear differential, it’s the MPS. Otherwise, it’s the FWD model without a centre-bearing.

Does a 2005 Mazda 6 have a centre-bearing?
Most 2005 Mazda 6 models (FWD) do not have a centre-bearing. Only the Mazda 6 MPS/Mazdaspeed6 AWD uses a centre-bearing on its two‑piece prop shaft.

How can someone tell if they need a centre-bearing or an intermediate shaft bearing?
If the car is an AWD MPS, the part in question is the prop shaft’s centre-bearing. If it’s a regular FWD 2005 Mazda 6, the relevant mid‑shaft support is the right‑hand axle’s intermediate (carrier) bearing, not a centre-bearing. Look under the car: no long shaft to a rear diff means no centre-bearing.

What are common symptoms of a failing centre-bearing on a Mazda 6 MPS?
Owners often report a droning or rumbling that changes with throttle, vibration through the floor at certain speeds, or a knocking on take‑off. Visual signs include a perished rubber mount around the bearing. Replacement involves removing the prop shaft and is best handled by a driveline specialist to ensure correct alignment and balance.