Suspension & Steering Certification (LS Codes – QLD)
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✅ What Are LS Modification Codes?
The LS Codes under the Queensland Code of Practice (QCOP) govern suspension, steering, tyres, wheel track, ride height, and vehicle mass modifications on light vehicles. If you’re lifting, lowering, changing steering systems, or re-rating your GVM or trailer, certification is likely required.
📘 Full LS Code List (Queensland – 2024)
| Code | QLD Description |
|---|---|
| LS1 | Steering Conversion – Design (LHD to RHD planning and engineering) |
| LS2 | Steering Conversion (LHD to RHD physical conversion) |
| LS3 | Front Suspension & Steering – Design (geometry changes, custom rack setup) |
| LS4 | Front Suspension & Steering – Modification (physical fitment of LS3 design) |
| LS5 | Rear Suspension – Design (multi-link, IRS or live axle designs) |
| LS6 | Rear Suspension – Modification (execution of LS5 designs) |
| LS7 | (Superseded – replaced by LS9 in QLD) |
| LS8 | (Superseded – replaced by LS10 in QLD) |
| LS9 | High Lift – Up to 150mm (Design Certification) – Lift design for suspension, tyres, body blocks |
| LS10 | High Lift – Up to 150mm (Modification Certification) – Execution & certification of approved |
| LS11 | Gross Vehicle Mass (GVM) Re-Rating – Design Certification for ladder-frame light vehicles |
| LS14 | Trailer ATM/GTM Re-Rating to Manufacturer Specs (under 4.5t only) |
| LS15 | GVM Modification Certification – Executing physical mods based on LS11 package |
| LS16 | Gross Combination Mass (GCM) Re-Rating – Design Certification |
⚙️ Examples of Modifications That Require LS Code Certification
- ✅ Suspension lifts above 50mm
- ✅ Coilovers, adjustable struts, solid axle swaps
- ✅ LHD to RHD steering conversions
- ✅ GVM increases for utes and commercial vehicles
- ✅ Trailer mass upgrades (ATM, GTM)
- ✅ Extended shackles, body blocks, or spring hanger relocations
- ✅ GCM increases for towing capacity (under design approval)
🛠️ Queensland Requirements at a Glance
| Modification Type | Max Limit Without Certification | Certification Required? |
|---|---|---|
| Tyres (larger diameter) | 25mm height increase | Not Legal |
| Suspension Lift | 50mm height increase | Over 50mm = Yes (LS9/10) |
| Total Lift (Suspension + Tyres) | 75mm | 76–150mm = Yes |
| Body Lift | 50mm max (25mm if suspension >75mm) | Yes |
| GVM Increase | N/A | Yes (LS11 & LS15) |
| GCM Increase | N/A | Yes (LS16 Design only) |
👷 Why Choose AutoCert?
- ✅ RPEQ engineer & Approved Person (AP)
- ✅ Fully mobile inspections across QLD
- ✅ LS1–LS16 code certification
- ✅ Fast turnaround for lifts, GVMs, and trailers
- ✅ Lane change test coordination (LT2) & ESC compliance