Parts for your 2005 Holden Commodore-Steering bushes

2005 Holden Commodore steering bushes — what they do and when to replace

Technical sources including the Holden VZ Commodore Service Manual (Steering — Rack and Pinion Mounting Insulators), the Gregory’s VT–VZ Service and Repair Manual (Steering section), and aftermarket catalogues from SuperPro and Nolathane confirm the 2005 Holden Commodore (VZ) uses steering rack mounting bushes (often called insulators) on the front crossmember. So yes, steering bushes are fitted and very much relevant to this model.

On the VZ, these bushes locate the power steering rack to the K‑frame while isolating vibration. When they harden, crack or oil-soak, the rack can shift under load, leading to vague on-centre feel, clunks over bumps and accelerated tyre wear. Keeping them healthy preserves steering precision and comfort.

What they’re for:

• Maintain steering rack alignment so toe stays consistent through bumps and cornering.
• Absorb road harshness to reduce noise and vibration in the cabin.
• Protect the rack housing by cushioning shock loads.

Service advice for a 2005 Commodore:

• Inspection interval: check at regular servicing or every 20,000–30,000 km, especially if the car sees rough roads or towing.
• Tell-tales: free play when levering the rack, visible cracks/ovalised bushes, oil-softened rubber from power-steering leaks, steering shimmy, or a knock when turning into driveways.
• Fix leaks first: power-steering fluid degrades rubber quickly.
• Alignment: get a wheel alignment after bush replacement to lock in straight-line stability and tyre life.

Replacement basics (workshop or confident DIY with stands/hoist):

1. Support the rack and relieve any strain on lines, on many cars the rack can be lowered enough to swap bushes without fully disconnecting hydraulics.
2. Mark positions, remove rack mount bolts, press out old bushes, clean bores.
3. Install new bushes in the correct orientation, refit hardware and torque to workshop spec, then road-test and align.

Parts choice:

• OE-style rubber: closest to factory feel, best NVH control.
• Polyurethane (e.g., SuperPro/Nolathane): sharper response and longevity, may add a touch more road feel. Great for spirited road use if cabin refinement isn’t the top priority.

When sorted, a VZ’s steering feels planted and predictable, with clean self‑centering and less tram‑lining. Given the age of these cars, fresh rack bushes are a cost‑effective way to bring the steering back to its best.

FAQs

How do you know the steering rack bushes are worn?
Common signs are a dull knock over small bumps, steering that feels loose on-centre, or the rack shifting when you rock the wheel with the engine off. A tech will spot cracked or ovalised bushes and play when levering the rack against the K‑frame.

Do you need a wheel alignment after replacing them?
Yes. Even if tie-rods aren’t disturbed, the rack’s position can change slightly with fresh, correctly sized bushes. An alignment tidies toe and ensures straight tracking and even tyre wear.

Rubber or polyurethane — which is better?
Rubber keeps the classic Commodore comfort and quietness. Polyurethane adds steering precision and typically lasts longer, with a mild increase in road feel. For a daily driver, rubber is spot-on, for a firmer, sportier feel, go poly.