Parts for your 2006 Toyota Bb-Universal joints

Are universal joints used on the 2006 Toyota bB?

Short answer: for most 2006 Toyota bB models, universal joints (the cross-type Cardan U-joints you’d see on a prop shaft) aren’t used. The 2006 bB is primarily a front‑wheel‑drive, transverse‑engine hatch, and Toyota’s own technical references back that up. The Toyota Electronic Parts Catalog (EPC) for QNC20/QNC21 lists front driveshafts with inboard and outboard constant‑velocity (CV) joints and no propeller shaft. The Toyota bB QNC20‑series Repair Manual sections for Drivetrain/AX – Drive Shaft (Front) also describe CV joints only. That means “universal-joints” aren’t a service item on typical FWD bB variants.

Why no U‑joints? In a FWD layout the engine sits sideways and drives the front wheels via short half‑shafts. Those shafts need to transmit drive smoothly while the wheels steer and move with suspension travel. CV joints maintain constant rotational speed at larger angles, which avoids vibration and torque ripple. Traditional prop‑shaft U‑joints don’t keep constant velocity at angle and are better suited to longitudinal RWD/4WD layouts, so they’re simply not the right tool for this job.

There is an exception worth noting. Some JDM 2006 bB grades were available with 4WD (model code QNC25). The EPC for QNC25 lists a Propeller Shaft Assembly with serviceable universal joints. If someone’s running one of those 4WD grey imports in Australia or New Zealand, they will have U‑joints at the rear prop shaft. In that case, periodic checks are wise: look for play at the joints, dried or split dust seals, rust bleed, clunks on take‑off and a buzz or shudder at highway speeds. Many are sealed, if grease nipples are fitted, a light pump of quality grease at service intervals can extend life. Excess free play or red dust generally means it’s time for replacement of the joint or the complete shaft, depending on parts availability.

• FWD bB (QNC20/QNC21): CV joints only, no universal joints to service.
• 4WD bB (QNC25): prop shaft with universal joints present and serviceable.
• Technical basis: Toyota EPC and QNC20‑series Repair Manual drivetrain sections.

Popular questions about 2006 Toyota bB universal joints

Does a 2006 Toyota bB have universal joints?
Most don’t. The common FWD versions use CV joints on the front half‑shafts and have no propeller shaft. Only the 4WD QNC25 variant carries a rear prop shaft with universal joints.

What are the symptoms of a worn U‑joint on a 4WD bB?
Look for a clunk when shifting from reverse to drive, a shudder on take‑off, or a vibration that ramps up with road speed. Under the car, any looseness at the joint caps or rust‑coloured dust around the bearings is a giveaway.

How often should the CV joints on a FWD bB be checked?
At every service or about every 10,000–15,000 km, inspect the CV boots for splits, grease fling and clamp condition. Replace torn boots promptly to save the joint, if there’s noise on full lock or heavy play, budget for a rebuilt or new shaft.