Heavy Vehicle Modifications

• A1: Engine substitution
• A2: Air cleaner substitution or additional fitment
• A3: Turbo charger installation
• A4: Exhaust system alteration
• A5: Road speed limiter installation

• B1: Transmission substitution of additional fitment

• C1: Tail shaft alterations

• D1: Rear axle installation
• D2: Differential substitution

• E1: Front axle installation

• F1: Suspension substitution
• F2: Trailer suspension modifications
• S1: GVM/GCM re-rating (to S2 or S3 approved design or within manufacturer's specifications)
• S7: ATM/GTM re-rating

• G1: Relocation of air brake components
• G2: Installation of trailer braking controls
• G3: Trailer brake system upgrade
• G5: Fitting of auxiliary and endurance brakes
• G6: Fitting of air operated accessories
• G7: Brake system substitution/wheelbase extension

• H1: Wheelbase extension outside OEM options
• H2: Wheelbase reduction outside OEM options
• H3: Wheelbase alterations within OEM
• H4: Chassis alteration
• H5: Trailer chassis modifications

• J1: Body mounting

• K1: Seating capacity alteration, seat, seatbelt and anchorage alteration
• K3: Cabin conversions
• K5: Installation of wheelchair occupant restraint system
• K6: Child restraint anchorage installation

 Fuel system alterations 

• P1: Towbar and coupling installation other than fifth wheels and kingpins
• P2: Fifth wheel and kingpin installation