Parts for your 2006 Toyota Bb-Centre bearing

2006 Toyota bB centre-bearing — is it actually there?

Based on Toyota’s own technical literature and parts catalogues, a centre-bearing is not fitted to the common 2006 Toyota bB models that are front‑wheel drive. The QNC20 (1.3L) and QNC21 (1.5L) variants drive the front wheels via a transaxle and short driveshafts, so there’s no long propeller shaft running down the car — and therefore no centre-bearing to support it. Only the less common QNC25 4WD variant uses a two‑piece propeller shaft, which incorporates a centre support bearing.

Why it isn’t used on most 2006 bB vehicles comes down to the layout. Front‑wheel drive packaging puts the engine, gearbox and differential up front, sending power straight to the front wheels. A centre-bearing is a support for the middle of a long, two‑piece tailshaft — a component you’ll find on rear‑wheel drive or 4WD setups. No tailshaft on a FWD bB means no centre-bearing to service or replace.

Owners can confirm their driveline by checking the model code on the build plate or paperwork:- QNC20/QNC21 = 2WD (no centre-bearing).- QNC25 = 4WD (centre-bearing present in the propeller shaft assembly).

For those few 4WD QNC25 cars, the centre-bearing supports the tailshaft to reduce vibration and maintain correct alignment. If the rubber isolator perishes or the bearing wears, drivers may notice a thump on take‑off or a buzz through the floor at road speeds. Inspection involves checking the propeller shaft support bracket and rubber mount for cracking, and assessing any excess play.

Technical sources referenced:- Toyota Electronic Parts Catalogue (EPC) for bB QNC2# series: propeller shaft/centre support bearing appears on QNC25 (4WD) diagrams, not listed for QNC20/QNC21.- Toyota Repair Manual and Drivetrain/Axle sections for bB QNC2# series: propeller shaft service procedures documented for 4WD only.- New Car Features (NCF) for bB QNC2# series: driveline layouts confirm FWD for QNC20/QNC21 and 4WD for QNC25.

Quick take: If the 2006 Toyota bB is a standard 2WD (QNC20/QNC21), a centre-bearing isn’t used or required. If it’s a QNC25 4WD, a centre-bearing is fitted in the propeller shaft and should be inspected when servicing driveline components.

FAQs

Does a 2006 Toyota bB have a centre-bearing?
Most don’t. The common 2WD bB (QNC20/QNC21) has no tailshaft and no centre-bearing. Only the QNC25 4WD variant uses a two‑piece propeller shaft with a centre support bearing. Check the model code on the build plate or look under the car for a rear differential and tailshaft.

How can someone tell if a bB QNC25 centre-bearing is worn?
Typical signs include a shudder on take‑off, vibration between about 40–80 km/h, a dull thump on gear changes, or visible cracking of the bearing’s rubber mount. With the car safely raised, the propeller shaft should have only minimal vertical movement at the support — excessive play points to a tired bearing.

Is a universal centre-bearing okay to use on a QNC25?
It’s best to match the correct dimensions and bracket style for the QNC25 tailshaft. An ill‑fitting bearing can cause vibration and premature wear. When replacing the bearing, mark shaft phasing, support the exhaust and shields, and have the shaft balanced if any components are changed.