Chevy Silverado 2500HD GVM Upgrades Explained: Which Stage Is Right for You?
- 21 hours ago
- 9 min read
The Silverado 2500HD is already a serious truck before anyone touches it. But if you’re planning to actually use it for full-time touring, serious towing or work, the factory GVM isn’t going to cut it once you start building.
This Offroad Industries (ORI) GVM upgrade package for the GMSV Chevy Silverado 2500HD LTZ is one of the most comprehensive American truck upgrades available in Australia. Up to 6,000kg GVM, up to 6.5 inches of lift, 35 or 37-inch tyres, NB2 reclassification, and a GCM of 12,474kg — across seven stages that cover everything from a practical 3-inch lift to a full coilover-converted setup on 37s.
Here’s how every stage breaks down and what each one is actually built for.
Silverado 2500HD GVM Upgrade: Factory Specs vs What’s Possible
The GMSV Silverado 2500HD LTZ arrives from factory well below its potential. With an ORI GVM upgrade installed pre-registration at BAW Automotive in Brisbane:
Spec | Factory Silverado 2500HD | With ORI GVM Upgrade |
GVM | Factory limited | Up to 6,000 kg |
GCM | Factory limited | 12,474 kg |
NB Category | — | NB2 |
Max Tyre Size | Factory | 37 inches |
Max Lift | Factory | 6.5 inches |
The GCM upgrade is LS16 certified for towing up to 4.5 tonnes and is available both pre and post registration. The NB2 reclassification may unlock potential tax benefits for eligible business use — worth a conversation with your accountant if this truck is doing work and trade kilometres.
Torsion Bar vs Coilover: The Key Difference Across the Stages
Before getting into individual stages, it’s worth understanding the core suspension difference that runs through this package — because it shapes the entire stage lineup.
The Silverado 2500HD runs a front torsion bar suspension from the factory. Torsion bars are a solid, proven setup that handles heavy loads well. Some stages retain and build on the torsion system — others convert to coilovers using a BDS Coilover Conversion kit.
A coilover conversion replaces the front torsion bar setup with a coilover shock and spring arrangement. The result is a more independent suspension feel, better wheel travel, and improved response to corrugations and uneven terrain — at the cost of additional complexity and price. If you’re planning heavy off-road use, a coilover conversion is the more capable setup. If you’re primarily touring and towing on Australian roads, the torsion-based stages are a more practical choice.
Stages 1, 2, 4, and 5 retain the torsion bar front suspension. Stages 3, 3.5, 6, and 6.5 include a BDS Coilover Conversion.
Silverado 2500HD GVM Upgrade Stages Explained
Stage 1 – 5,500kg GVM | 3 Inch Lift
Best for: Working trucks and builds that need a serious GVM result with heavy-duty shocks designed for sustained load use.
Key components:
Fox 2.5 HTO Performance Series Shocks (Front and Rear)
BDS Control Arms
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
ORI ADR Compliance Lights
Spec | Details |
GVM | 5,500 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 1,708 kg |
Lift | 3 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 |
Wheels | Aftermarket required (min. 1600 kg load rating) Offset: 0 | +12 | +18 |
Suspension | Torsion bar (factory retained) |
What it means in real life: Stage 1 is the only stage using the Fox 2.5 HTO — a heavy-duty shock built with a larger body and more fluid capacity specifically for trucks that spend time under serious load. If this truck is working for a living, Stage 1 is worth considering.
Stage 2 – 6,000kg GVM | 3 Inch Lift
Best for: The full 6,000kg GVM result with the most versatile all-round shock, on a torsion bar setup. Suits 35 or 37-inch tyres.
Key components:
Fox 2.5 Performance Elite Series Shocks (Front and Rear)
BDS Control Arms
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
ORI ADR Compliance Lights
Spec | Details |
GVM | 6,000 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 2,198 kg |
Lift | 3 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 | 37x12.5xR18 | 37x12.5xR20 |
Wheels | Aftermarket required (min. 1644 kg load rating) Offset: 0 | +12 | +18 |
Suspension | Torsion bar (factory retained) |
What it means in real life: Maximum 6,000kg GVM, maximum payload of 2,198kg, and Fox 2.5 Performance Elite shocks that handle mixed Australian conditions without compromise. This is the practical choice for most 2500HD owners who want the best GVM result without converting the front suspension.
Stage 3 – 6,000kg GVM | BDS Coilover Conversion
Best for: The full 6,000kg GVM with a coilover conversion for improved off-road performance and wheel travel.
Key components:
Fox 2.5 Performance Elite Series Shocks (Front and Rear)
BDS Coilover Conversion
BDS Control Arms
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
ORI ADR Compliance Lights
Spec | Details |
GVM | 6,000 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 2,190 kg |
Lift | 3 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 | 37x12.5xR18 | 37x12.5xR20 |
Wheels | Aftermarket required (min. 1644 kg load rating) Offset: 0 | +12 | +18 |
Suspension | BDS Coilover Conversion |
What it means in real life: Same maximum GVM as Stage 2, with the coilover conversion giving you better front wheel travel and a more refined response to rough terrain. The trade-off is complexity and cost — for most builds that spend time on corrugated dirt, it’s worth it.
Stage 3.5 – 6,000kg GVM | BDS Coilover + Kelderman Air Suspension
Best for: Maximum GVM with a coilover conversion front and Kelderman 4-link rear air suspension — the most capable 3-inch setup in the range.
Key components:
Fox 2.5 Performance Elite Series Shocks (Front and Rear)
BDS Coilover Conversion
Kelderman 4-Link Rear Air Suspension (0–3 inches)
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
ORI ADR Compliance Lights
Spec | Details |
GVM | 6,000 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 2,190 kg |
Lift | 3 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 | 37x12.5xR18 | 37x12.5xR20 |
Wheels | Aftermarket required (min. 1644 kg load rating) Offset: 0 | +12 | +18 |
Suspension | BDS Coilover Conversion (Front) + Kelderman 4-Link Air (Rear) |
What it means in real life: The Kelderman 4-link rear air suspension is an adjustable setup that lets you tune rear ride height and load support. Combined with the BDS coilover conversion up front, Stage 3.5 is the most technologically sophisticated 3-inch setup in the range — for builds where air suspension’s adjustability is a genuine advantage.
Stage 4 – 6,000kg GVM | Torsion 5 Inch Lift
Best for: Maximum GVM with a torsion-based 5-inch lift — significant height, 35 or 37-inch tyres, without a coilover conversion.
Key components:
Fox 2.5 Performance Elite Series Shocks (Front and Rear)
Torsion 5-inch Lift Kit
BDS Control Arms
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
ORI ADR Compliance Lights
Spec | Details |
GVM | 6,000 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 2,138 kg |
Lift | 5 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 | 37x12.5xR18 | 37x12.5xR20 |
Wheels | Aftermarket required (min. 1644 kg load rating) Offset: 0 |
Suspension | Torsion bar (5-inch lift kit) |
What it means in real life: A significant visual step up from Stages 1–3 without converting the front suspension. Stage 4 gives you 5 inches of lift and 35 or 37-inch tyres on the factory torsion system — with the full 6,000kg GVM result. The simplest path to a big lift.
Stage 5 – 6,000kg GVM | Torsion 6.5 Inch Lift
Best for: Maximum GVM on the biggest torsion-based lift in the range. 6.5 inches, 37-inch tyres, 6,000kg GVM.
Key components:
Torsion 6.5-inch Lift Kit
Fox 2.5 Performance Elite Series Shocks (Front and Rear)
BDS Control Arms
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
ORI ADR Compliance Lights
Spec | Details |
GVM | 6,000 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 2,138 kg |
Lift | 6.5 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 | 37x13.5xR18 | 37x13.5xR20 |
Wheels | Aftermarket required (min. 1644 kg load rating) Offset: 0 |
Suspension | Torsion bar (6.5-inch lift kit) |
What it means in real life: The Silverado 2500HD on 6.5 inches of lift with 37-inch tyres is a statement — there’s no other way to describe it. Stage 5 gets you that result while retaining the torsion front suspension and hitting the full 6,000kg GVM.
Stage 6 – 6,000kg GVM | Fox 2.5 Elite | BDS Coilover + 6.5 Inch Lift | 35s or 37s
Best for: Maximum GVM and maximum lift with a coilover conversion — the best of the big lift stages for serious off-road use.
Key components:
BDS Coilover Conversion
Fox 2.5 Performance Elite Coilover (Front)
Fox 2.5 Performance Elite Series Shocks (Rear)
BDS Control Arms
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
ORI ADR Compliance Lights
Professional installation, wheel alignment, freight from ORI HQ Melbourne
Spec | Details |
GVM | 6,000 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 2,138 kg |
Lift | 6.5 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 | 37x13.5xR18 | 37x13.5xR20 |
Wheels | Aftermarket required (min. 1644 kg load rating) Offset: 0 |
Suspension | BDS Coilover Conversion (6.5-inch lift) |
What it means in real life: Stage 6 combines the visual impact of 6.5 inches and 37-inch tyres with a coilover conversion front end for the best wheel travel and off-road response at that height. This is the top setup for a 2500HD that gets driven hard on corrugated tracks.
Stage 6.5 – 6,000kg GVM | Fox 2.5 Elite Coilover | Kelderman Air Rear | 6.5 Inch Lift | 35s or 37s
Best for: The complete package — coilover front, Kelderman 4-link air suspension rear, 6.5-inch lift, maximum GVM.
Key components:
Fox 2.5 Performance Elite Coilover (Front)
Fox 2.5 Performance Elite Series Shocks (Rear)
BDS Control Arms
500kg ORI Rear Leaf Packs
Husky Extenda Flares
ORI Mud Flaps Kit
Kelderman 4-Link Rear Air Suspension (5–6 inches)
Professional installation, wheel alignment, freight from ORI HQ Melbourne
Spec | Details |
GVM | 6,000 kg |
GCM | 12,474 kg |
NB Category | NB2 |
Payload | 2,138 kg |
Lift | 6.5 inches |
Tyre Size | 35x12.5xR18 | 35x12.5xR20 | 37x13.5xR18 | 37x13.5xR20 |
Wheels | Aftermarket required (min. 1644 kg load rating) Offset: 0 |
Suspension | Fox Coilover (Front) + Kelderman 4-Link Air (Rear) |
What it means in real life: Stage 6.5 is the top-spec setup in the entire range. Coilover front, Kelderman 4-link air suspension rear at 5–6 inches, Fox 2.5 Performance Elite throughout, 6.5-inch lift, 37-inch tyres, and the full 6,000kg GVM. If you’re building the Silverado 2500HD to the absolute maximum of what ORI can do with it — this is it.
Which Stage Should You Choose?
Here’s the simplest way to cut through it:
For GVM: Stages 2 through 6.5 all deliver the full 6,000kg GVM. Stage 1 sits at 5,500kg — still a significant upgrade, and the only stage with the Fox 2.5 HTO heavy-duty shock.
For lift height: Stages 1–3.5 give you 3 inches. Stage 4 jumps to 5 inches. Stages 5, 6, and 6.5 go to 6.5 inches.
For suspension setup: Stages 1, 2, 4, and 5 retain the factory torsion bar front with a lift kit on top — simpler, proven, and well suited to most touring and towing setups. Stages 3, 3.5, 6, and 6.5 include a BDS Coilover Conversion for improved wheel travel and off-road response, with Stages 3.5 and 6.5 also adding Kelderman 4-link rear air suspension.
For tyres: Stage 1 is 35s only. All other stages support 35 or 37-inch tyres.
Silverado 2500HD GVM Upgrade: Frequently Asked Questions
What is the maximum GVM for the Silverado 2500HD GVM upgrade?
The maximum GVM available is 6,000kg, achieved across Stages 2 through 6.5. Stage 1 delivers 5,500kg. All stages include NB2 reclassification, which may unlock potential tax benefits for eligible business use.
Can I run 37-inch tyres on the Silverado 2500HD with a GVM upgrade?
Yes — Stages 2 through 6.5 all support 37-inch tyres. Stage 1 is limited to 35s. The 6.5-inch lift stages (5, 6, and 6.5) support 37x13.5-inch tyres; the 3 and 5-inch lift stages support 37x12.5-inch tyres.
What is the difference between torsion bar and coilover on the Silverado 2500HD?
The factory Silverado 2500HD runs a front torsion bar suspension. Stages that retain the torsion system use a lift kit to achieve the desired height — a simpler, more cost-effective setup that handles touring and towing well. Stages with a BDS Coilover Conversion replace the torsion bar with a coilover shock and spring setup, giving better wheel travel and more refined off-road performance. For most touring and road-based use, torsion is the practical choice. For serious off-road use, the coilover conversion is worth the step up.
What is the NB2 category and do I need a truck licence?
All stages of this upgrade reclassify the Silverado 2500HD into the NB2 vehicle category, which applies to vehicles over 4,500kg GVM. NB2 vehicles require a Heavy Rigid (HR) licence to drive in Australia. If you don’t currently hold an HR licence, this is something to factor into your decision before purchasing. The NB2 classification may also unlock potential tax benefits for eligible business use.
Is this GVM upgrade available post-registration?
Yes. Post-registration installs may require separate state engineering certification, which is not included in kit pricing. Pre-registration SSM installation at BAW Automotive in Brisbane gives you full federal approval across all states and territories without additional certification.
Chevy Silverado 2500HD GVM Upgrade: Final Thoughts
The Silverado 2500HD is already built for serious work. This ORI GVM upgrade package takes that further than any other option currently available in Australia — up to 6,000kg GVM, 6.5-inch lift, 37-inch tyres, and a range of suspension configurations that cover everything from practical daily-drive-and-tow setups to full off-road-optimised builds.
All seven stages are federally approved under VTA-065187 and VTA-065796, and professionally installed at BAW Automotive in Brisbane. If you want to work out which stage suits your build and budget, book a free quote with the team and we’ll get it sorted.
— INTERNAL LINK SUGGESTIONS FOR EDITOR: 'touring and towing setups' → /gvm-upgrades | 'book a free quote' → /build-my-4x4 | Remove this paragraph before publishing. —
