The Dobinsons IMS 3" Lift Kit is engineered specifically for the Holden Colorado RG and pairs IMS foam cell shock absorbers with vehicle-matched coil and leaf springs for a full suspension upgrade. The kit lifts the front and rear a genuine 3" and includes upper control arms, a front diff drop kit and brake line relocation to keep CV and driveline angles correct at ride height. Foam cell shock technology reduces oil aeration on corrugations, giving steadier damping than a standard shock absorber under sustained off-road use. Dispatched from Australian stock with Dobinsons' manufacturer warranty and fitment support from our team.
Browse all compatible suspension parts for your Holden Colorado Rg using our parts finder.
| Make | Model | Series | Years | Engine |
|---|---|---|---|---|
| Holden | Colorado | RG | 2012–2020 | 2.8L Duramax Diesel |
| Holden | Colorado | RG | 2012–2020 | 2.5L Diesel |
Not sure if this fits your vehicle? Contact our suspension experts or check our FAQ page.
Lift height compliance: Suspension lifts of this size may exceed your state's allowable limit without engineering certification. Check your state's light vehicle modification rules (VSB14/NCOP) before fitting.
Choosing the right rear leaf spring rate depends on what you're carrying day to day, not just occasional trips. If you're running a tray, canopy, dual battery setup, water tanks or towing regularly, a heavier constant-load rated spring keeps the rear from sagging and stops the vehicle riding nose-high. Front coil rate selection should account for a bull bar, winch and driving lights, since this added weight sits ahead of the axle and changes ride height if the rate is too soft.
This kit involves diff drop brackets, control arm changes and brake line relocation, so we recommend fitment by an experienced 4WD suspension installer rather than a home DIY job. A wheel alignment is mandatory after installation to bring castor, camber and toe back within spec at the new ride height. Allow a 500km bed-in period for springs and bushes to settle before a final alignment check. Consider pairing this kit with our control arm upgrades if you're also running larger tyres that increase steering loads.
Dobinsons has built 4WD suspension for Australian conditions for decades, with kits developed and tested locally rather than adapted from overseas markets. Every IMS kit is backed by Dobinsons' manufacturer warranty, and our team can talk you through spring rate and shock selection before you order. View the full Dobinsons range to compare this IMS kit against their MRA adjustable and standard foam cell options.
This kit suits Colorado RG owners who tow regularly, carry a canopy or tray for work, or are setting up for remote touring with roof top tents and long-range fuel. Tradespeople running constant tool and equipment loads benefit from the rear leaf spring's higher constant-load rating. If your accessory load varies significantly trip to trip, also look at our airbag suspension options to fine-tune rear support on the fly.
This Dobinsons IMS 3" Lift Kit is dispatched from Australian stock, backed by manufacturer warranty, and our team is available to confirm fitment before you buy. Browse our full lift kit range to compare options for your Colorado RG.
New to Colorado suspension? Read our guide to common Colorado suspension problems and how to fix them.
This kit provides a 3" lift front and rear on the Colorado RG. The lift comes from a combination of taller coil springs at the front and reprofiled leaf spring assemblies at the rear, matched with IMS shocks valved for the increased travel. The diff drop kit is included specifically to correct CV angles created by this height of lift.
Please note that all assembled struts are dispatched at a height based on our experience and the manufacturer’s specifications for the advertised lift. Coil springs and leaf springs are also manufactured according to the advertised height and constant-load rating. Actual vehicle height may vary depending on the vehicle and the weight of fitted accessories. Further adjustment may therefore be required after installation. The installer may use coil spacers or adjust the struts at their discretion to achieve the desired height. We are not responsible for vehicle-specific height variations or any additional adjustments required after installation.
The kit includes front and rear IMS foam cell shock absorbers, matched front coil springs, rear leaf spring assemblies, adjustable upper control arms, a front diff drop kit and a brake line relocation kit. All mounting hardware, U-bolts and bushes needed for front and rear fitment are supplied. See the full kit contents list on this page for exact quantities.
Yes, the rear leaf spring assemblies in this kit are rate-selected to support constant accessory and towing loads better than the factory RG leaf pack. Combined with the IMS rear shocks, this gives more stable rear-end control under a loaded tow ball weight. If your towing setup is at the heavier end, mention this to our team so we can confirm the leaf rate suits your typical load.
Upper control arms are already included in this kit, so no separate purchase is needed for this specific product. They're fitted to correct castor angle and CV joint operating angle at the 3" lift height, which a spring-only lift can't achieve on the RG. This avoids the uneven tyre wear and vibration that comes from running factory control arms too far outside their design angle.
Yes, a full wheel alignment is mandatory after installing this kit. The 3" lift changes castor, camber and toe from factory settings, and correct alignment is needed for even tyre wear and stable steering. We recommend a further alignment check after the 500km bed-in period once springs and bushes have settled.
Dobinsons offers the RG leaf springs in different constant-load ratings, so if your accessory or towing load is heavier or lighter than standard, a different rate may suit better than the one included in this kit. Contact our team with your typical loaded weight — canopy, dual battery, water tanks, tow ball weight — and we'll confirm the right rate before dispatch. Front coil rate can also be adjusted if you're running a heavy bull bar and winch combination.
A 3" lift on the Colorado RG generally clears larger tyre diameters than standard, but exact clearance depends on wheel offset and width as well as tyre size. We recommend checking your specific tyre and wheel combination with our team before ordering larger rubber, since flares or minor trimming may be needed at the top end of tyre sizing. The included diff drop kit and control arms are set up to work with common up-sized tyre fitments on the RG.
This kit is covered by Dobinsons' manufacturer warranty on shocks and springs, in line with their standard terms for foam cell shock absorbers and leaf/coil springs. Warranty covers manufacturing defects under normal on and off-road use. Keep your proof of purchase and installation records, and contact our team directly if you have a warranty query on this kit.
Yes, the IMS foam cell shocks are valved to give a controlled, comfortable ride on sealed roads while still handling corrugations and off-road travel without excessive body movement. Many Colorado RG owners run this kit as their daily driver and weekend tow vehicle. A wheel alignment after fitting is what keeps daily on-road manners sharp, particularly tyre wear and steering feel.
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