The VY and VZ Commodore are widely regarded as some of Holden’s best-balanced rear-wheel-drive vehicles. With independent rear suspension (IRS), improved ride quality, and refined handling compared to earlier models, they remain popular daily drivers and project cars.
However, as these vehicles age and accumulate kilometres, suspension wear becomes increasingly common. Worn bushes, leaking shocks, sagging springs, and steering-related issues can affect handling, ride comfort, tyre wear, and overall safety.
Why Suspension Problems Occur
Suspension components are constantly exposed to:
Factors
- Road impacts
- Heat
- Dirt
- Water
- Heavy loads
Over time, rubber bushes, ball joints, shock absorbers, and springs naturally wear out.
Many VY and VZ Commodores now have well over 200,000 kilometres on the odometer, making suspension maintenance essential.
Common Suspension Symptoms
Warning Signs
- Clunking noises
- Uneven tyre wear
- Steering wander
- Poor handling
- Excessive body roll
- Vibration
- Knocking over bumps
- Sagging ride height
Most suspension faults worsen gradually.
1. Front Control Arm Bush Wear
One of the most common VY and VZ suspension issues.
Symptoms
- Clunking noises
- Steering instability
- Uneven tyre wear
- Vehicle pulling
Causes
- Rubber deterioration
- Age-related wear
The front lower control arm bushes often require replacement after high kilometres.
Typical Repair
Replace worn bushes or complete control arms.
2. Ball Joint Wear
Ball joints are critical steering and suspension components.
Symptoms
- Knocking noises
- Steering looseness
- Uneven tyre wear
Causes
- High kilometres
- Road impacts
Typical Repair
Replace worn ball joints or complete control arm assemblies.
3. Shock Absorber Wear
Shock absorbers lose effectiveness over time.
Symptoms
- Excessive bouncing
- Poor ride control
- Increased body roll
Causes
- Internal wear
- Fluid leakage
Typical Repair
Replace shocks in axle pairs.
4. Sagging Springs
Common on older Commodores.
Symptoms
- Low ride height
- Uneven vehicle stance
- Reduced suspension travel
Causes
- Spring fatigue
- Heavy loads
Typical Repair
Replace springs.
5. Rear IRS Bush Wear
A very common Commodore problem.
Symptoms
- Rear-end movement
- Clunking noises
- Unstable handling
Causes
- Age-related bush deterioration
The independent rear suspension contains multiple bushes that wear over time.
Typical Repair
Replace worn IRS bushes.
6. Differential Bush Failure
Closely related to rear suspension performance.
Symptoms
- Driveline clunk
- Rear-end movement
- Harsh gear changes
Causes
- Rubber deterioration
- Torque loads
Typical Repair
Replace differential mounting bushes.
7. Strut Top Mount Wear
Often overlooked.
Symptoms
- Front suspension noise
- Steering issues
- Knocking sounds
Causes
- Age
- Shock absorber wear
Typical Repair
Replace strut top mounts during shock replacement.
8. Sway Bar Link Wear
Common after high kilometres.
Symptoms
- Rattling noises
- Clunking over bumps
Causes
- Worn ball joints
- Bush deterioration
Typical Repair
Replace sway bar links.
9. Sway Bar Bush Wear
A common source of front-end noise.
Symptoms
- Squeaks
- Rattles
- Reduced handling precision
Causes
- Rubber wear
Typical Repair
Replace sway bar bushes.
10. Wheel Alignment Problems
Often caused by worn suspension components.
Symptoms
- Uneven tyre wear
- Vehicle pulling
- Poor steering response
Causes
- Bush wear
- Suspension damage
Typical Repair
Repair worn components and perform alignment.
Common Rear Suspension Problems
The VY and VZ IRS system provides excellent handling but contains numerous wear items.
Common Faults
- IRS bushes
- Differential bushes
- Rear shock absorbers
- Rear springs
Most high-kilometre vehicles will require some rear suspension work.
Common Front Suspension Problems
Frequently Worn Components
- Control arm bushes
- Ball joints
- Strut mounts
- Sway bar links
These are among the most commonly replaced suspension components.
How to Diagnose Suspension Problems
Step 1: Road Test
Listen for:
Clunks
Often bushes or ball joints.
Rattles
Usually sway bar links or bushes.
Bouncing
Typically shock absorber wear.
Step 2: Visual Inspection
Check for:
- Cracked bushes
- Leaking shocks
- Broken springs
Step 3: Inspect Tyres
Uneven wear often indicates suspension issues.
Step 4: Check Ride Height
Look for:
- Sagging corners
- Uneven stance
Step 5: Wheel Alignment Check
Poor alignment often reveals worn suspension components.
Most Common VY, VZ Suspension Problems Ranked
1. Front Control Arm Bushes
Most common fault.
2. Rear IRS Bushes
Extremely common.
3. Shock Absorber Wear
Expected with age.
4. Differential Bushes
Common driveline-related issue.
5. Sway Bar Links
Frequent source of rattles.
Common Misdiagnoses
Tyre Noise Mistaken for Suspension Noise
A common mistake.
Steering Rack Faults
Can mimic suspension wear.
Differential Clunks
Often confused with suspension problems.
Wheel Bearing Noise
May resemble suspension-related sounds.
When to Replace Suspension Components
Replacement is recommended when:
Symptoms
- Excessive movement
- Cracked bushes
- Fluid leaks
- Poor ride quality
- Noise
Ignoring wear can affect vehicle safety.
Benefits of Suspension Maintenance
Advantages
- Improved ride quality
- Better handling
- Reduced tyre wear
- Increased safety
- Better steering response
Suspension repairs often make a vehicle feel significantly newer.
Suspension Upgrades Worth Considering
Many owners upgrade while replacing worn components.
Popular Upgrades
- Performance shocks
- Heavy-duty bushes
- Lowering springs
- Larger sway bars
These upgrades can improve both handling and appearance.
Warning Signs Requiring Immediate Attention
- Severe steering instability
- Broken springs
- Excessive suspension movement
- Major tyre wear
- Loud suspension knocks
These faults should be inspected promptly.
Suspension problems are a normal part of ownership for ageing VY and VZ Commodores. Worn bushes, tired shock absorbers, sagging springs, and IRS-related wear are among the most common issues and can significantly affect handling, comfort, and tyre life.
The good news is that most suspension faults can be identified early and repaired relatively easily. Regular inspections and timely maintenance can keep a VY or VZ Commodore driving smoothly and safely for many years while preserving the excellent ride and handling characteristics that made these models so popular.
Related Articles
- Best Suspension Upgrades for VY, VZ Commodores
- VY, VZ Lowering Guide
- VT, VX, VY, VZ Tailshaft Vibration Guide
- VY, VZ Commodore Power Steering Problems
- How to Inspect a Commodore Before Buying