All Vehicle Mods Qld

Bill 0407 148 054

Heavy vehicle modifications

Heavy Vehicles are vehicles whose weight exceeds 4.5 tons

The National Heavy Vehicle Regulator (NHVR) has classified the type of heavy vehicle modifications that require approval, either by an Approved Vehicle Examiner (AVE) or the NHVR. For minor modifications (that don't require approval) the NHVR cannot provide an exhaustive list, but general guidance is provided below on the limited type of modifications classified as minor.

Minor modification:

Minor modification includes the fitting of optional equipment or alterations to a vehicle within manufacturer’s specifications that do not cause the vehicle to be non-compliant with heavy vehicle standards. Should clarification be required on whether a modification requires approval the NHVR will make a determination.

Examples include; additional lighting, aerials, air conditioning, alarm systems, plastic shields for lamps and windscreens, and manufacturer’s wheel and tyre options (that do not affect the Gross Vehicle Mass (GVM) or Gross Combination Mass (GCM) rating of the vehicle). These modifications do not require approval provided the vehicle continues to be within manufacturer’s specifications and comply with the heavy vehicle standards.

Modifications under the Code of Practice - require approval by an AVE

This includes complex modifications that can affect the safety of a vehicle if not performed properly. The modifications included in the Code are based on accepted vehicle engineering practices and the requirements of the heavy vehicle standards. The Code also supplements the recommendations of the original vehicle manufacturer in relation to vehicle modification techniques or standards and provides guidelines where manufacturer’s specifications do not exist.

The Code applies the existing National Code of Practice Vehicle Standards  – Heavy Vehicle Modifications.

Vehicles modified in accordance with the Code maintain the vehicle’s compliance with the heavy vehicle standards. These modifications require approval by an AVE who will issue a modification certificate and ensure a modification plate is affixed to the vehicle if the vehicle passes inspection. The vehicle may require a further inspection subject to particular jurisdiction registration laws.

All Vehicle Mods provides a Mobile Approved Vehicle Examiner service 


Heavy Vehicle Modification Codes


ENGINE: Engine Substitution, Air Cleaner Substitution or Additional Fitment, Turbo Charger Installation, Exhaust System Alterations, Road Speed Limiter Installation


TRANSMISSION: Transmission Substitution or Additional Fitment


TAILSHAFT: Tailshaft Alterations


REAR AXLE: Real Axle/s Installation, Differential Substitution


FRONT AXLE: Front Axle installation


SUSPENSION: Suspension Substitution, Trailer Suspension Modification 


BRAKES: Air Brake System - Repositioning of Controls, Valves & Pipework, Fitting of Trailer Brake 10 plus Connections & Controls on Prime Movers, Trailer Brake System Upgrading, Auxilliary Brake Installation, Air Operated Accessories, Brake System Substitution


CHASSIS: Wheelbase Extension greater than 1st Manufacturer's Option, Wheelbase Reduction less than 1st Manufacturer's Option, Wheelbase Extension or Reduction within 1st Manufacturer's Option, Chassis Frame Alteration other than Change in Wheelbase, Trailer Chassis Frame Modification


BODY: Mounting of Body - Vehicles greater than 4.5 tonne GVM


CABIN: Seating Capacity Alteration & Seat Belt Alteration, Cabin Conversion, Wheelchair Restraint Installation, Child Restraint Installation


FUEL TANK: Fuel Tank repositioning or Additional Fitting


TOWING: Tow Coupling Installation Vehicle greater than 4.5 tonne GVM, Fifth Wheel & King Pin Installation 


CRANE: Truck Mounted Crane Installation 1.0 to 10 metre tonne capacity


GOODS LOADING: Goods Loading Device Installation


GVM: Gross Vehicle Mass Rating within Manufacturer's Specification, Omnibus Evaluation, Aggregate Trailer Mass Rating


TOW TRUCKS: Construction of Tow Trucks

Heavy Vehicle Modifications

Heavy Vehicle Registration Assessment Scheme

Heavy Vehicle Certifications

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0407 148 054 (Bill)