Parts for your 2004 Toyota Bb-Gas struts

2004 Toyota bB gas struts — what they do and when to swap them

Based on Toyota’s own technical literature and parts catalogues for the NCP30/NCP31/NCP35 bB platform — and the equivalent 2004 Scion xB repair manual used in export markets — the vehicle is factory-fitted with gas-pressurised “Back Door Stays” on the tailgate. These are the familiar gas struts that hold the rear hatch up. The bonnet on this model uses a prop rod from factory, not gas struts. So yes, gas struts are relevant to a 2004 Toyota bB, specifically for the rear hatch.

On a 2004 Toyota bB, the tailgate gas struts make daily use a breeze. They counterbalance the hatch so it lifts smoothly and stays put — no shoulder workout, no sudden drops on the back of the head. Each unit is a sealed, nitrogen-charged cylinder with oil for damping, sized to the hatch weight and hinge geometry.

As part of regular servicing, it’s smart to give the gas struts a quick once-over. They’re wear items and their output fades over time, faster in colder climates or with lots of tailgate usage. If the hatch lifts sluggishly, won’t stay up, or sags in a breeze, the struts are due. A light oil mist around the shaft seal is another tell-tale.

• Replace in pairs. Matching force keeps the hatch balanced and prevents hinge stress.
• Never grease the chrome rod — it attracts grit and chews the seal. Keep it clean and dry.
• Support the tailgate before removal. These struts are under pressure and the hatch is heavier than it looks.
• Use correct end fittings (ball sockets/retainers) to suit the bB’s mounts, avoid levering on the rod.
• Aftermarket options exist, but choose OE-equivalent length and force to maintain proper lift height.

Most owners will see 5–10 years from a set, but age, heat, and dust all play a part. If the car parks outside in the sun, the struts can feel a bit stronger when hot and weaker on frosty mornings — that’s normal behaviour for gas-charged units. When replacing, check the tailgate hinges and latch alignment too, sticky hardware makes new struts work harder than they should.

Does the 2004 Toyota bB have gas struts from factory?

Yes — the tailgate is supported by gas-pressurised “Back Door Stay” units as shown in Toyota’s parts listings and body mechanical procedures for the NCP30-series bB. The bonnet uses a prop rod.

How long do they last, and when should they be replaced?

Typically 5–10 years. Replace when the hatch won’t stay up, lifts slowly, or shows oil mist at the seal. Always replace both sides together for balanced operation.

Can bonnet gas struts be added to a 2004 bB?

They’re not a factory fit on this model, but quality aftermarket kits exist. Choose a kit designed for the bB/xB with brackets that use factory mounting points, and confirm clearance with the bonnet and guards.