The Airbag Man Coil Spring Helper Kit suits Isuzu MU-X 2013-ON and fits inside the factory rear coil springs, adding adjustable air support from 5 PSI up to 100 PSI to correct sag from tow ball weight, camper trailers and roof-top tents. Available as standard-height CR5122 or 2" lifted CR5133, it uses a Firestone rubber air bladder backed by a lifetime manufacturer warranty. It works alongside your existing coil springs rather than replacing them, and installs in around 2 hours using the factory mounting points. In stock in Australia with fitment support from our suspension team.
Airbag Man helper kits use coil-insert air springs that sit inside the existing coils – add air when the load goes on to bring the vehicle back level, then let it out and the standard springs carry on exactly as before. Because each side inflates independently, you can also correct for an off-centre load like a slide-on or water tank.
They shine when the load keeps changing – a van on the towball some weekends, a loaded tray on others. Worth being clear about what they don't do: helper airbags don't increase your GVM or payload; they manage ride height and stability within the vehicle's existing ratings. If the vehicle is always loaded, upgraded springs (with airbags for the variation on top) is the better setup.
Browse all compatible suspension parts for your Helper Kit Isuzu Mu-X 2013-On using our parts finder.
Because this kit is a variable-pressure air bag rather than a fixed-rate spring, you don't need to pick a spring rate — you set the pressure between 5 and 100 PSI to suit the load on the day. Choose the standard-height CR5122 if your MU-X sits at factory ride height, or the 2" lifted CR5133 if you've already fitted a 2" front lift and want the rear to sit level. Common accessories that change your typical rear load include a tow ball weight from a caravan or box trailer, a rear canopy or drawer system, a roof-top tent, and rear-mounted water tanks or long-range fuel tanks.
The air bags mount inside the factory rear coil spring using the supplied brackets, and most experienced DIY installers complete the job in around 2 hours with basic hand tools. Because the bags sit inside the existing coil and don't alter suspension geometry when deflated, a wheel alignment isn't mandatory for a standard fitment — but check ride height and toe/camber if you're running the CR5133 lifted version or towing loaded most of the time. Inspect air line fittings and inflation valves after the first 500km of towing to confirm there's no chafing or leaks. If you're also lifting the front end, pair this kit with upgraded control arms to keep front geometry correct.
Airbag Man designs its helper kits specifically for Australian 4WDs and towing setups, using an air bladder sourced from Firestone that carries a lifetime warranty on the bag itself. The kit is a genuine load-assist accessory rather than a fixed spring upgrade, letting you carry both empty and fully loaded runs without changing parts. You can view the full Airbag Man range for other MU-X suspension options including matched shocks and lift kits.
This kit suits MU-X owners who tow caravans or box trailers regularly and need to stop rear sag at the tow ball, tradies running a canopy and tool storage, and tourers carrying roof-top tents or water tanks. If your load varies a lot between trips, airbag suspension like this gives you adjustable support without needing multiple spring rates.
Ready to fit it to your MU-X? This kit ships from Australian stock with fitment support from our team — browse our full lift kit range if you're planning a front-end upgrade too.
| Make | Model | Series | Years | Engine |
|---|---|---|---|---|
| Isuzu | MU-X | UC Series | 2013–2020 | 3.0L 4JJ1-TCX turbo-diesel |
| Isuzu | MU-X | RJ Series | 2021–on | 3.0L 4JJ3-TCX turbo-diesel |
Not sure if this fits your vehicle? Contact our suspension experts or check our FAQ page.
New to D-MAX and MU-X suspension? Read our guide to common D-MAX and MU-X suspension problems and how to fix them.
Genuine Airbag Man suspension from an authorised Australian dealer.
Yes, this Airbag Man Coil Spring Helper Kit (CR5122-CR5133) is built for the Isuzu MU-X from 2013 onwards, covering both the UC series (2013–2020) and the RJ series (2021-on). It fits inside the factory rear coil springs using the supplied mounting brackets. If you're unsure which generation you have, check your build plate year or contact our team with your VIN for confirmation.
This kit isn't a lift kit — it's an air-adjustable load helper that sits inside your existing rear coil springs. It's sold in two versions: CR5122 for a standard ride height MU-X, and CR5133 for an MU-X already running a 2" front lift, so the rear sits level. Ride height under load is controlled by air pressure between 5 and 100 PSI rather than a fixed spring change.
The kit includes 2 Airbag Man air bags with Firestone bladder construction, 2 mounting brackets, 2 inflation valves, an air line kit with a T-piece for dual connection, cable ties and hardware, plus fitting instructions for either the CR5122 or CR5133 configuration. Shock absorbers, coil springs and control arms are sold separately.
Yes, it's designed for exactly this — correcting rear sag caused by tow ball weight from a caravan or box trailer. You inflate the air bags before hitching up to level the rear end and deflate them again for unladen driving, which helps maintain headlight aim and brake balance while towing.
Not for this rear coil spring helper kit on its own, since it doesn't change front suspension geometry. If you're also fitting a front lift kit at the same time, upgraded control arms are worth considering to correct front camber and caster angles at the new ride height.
A wheel alignment isn't mandatory for a standard CR5122 fitment, because the air bags sit inside the factory coil spring and don't alter suspension geometry when deflated. If you're running the CR5133 lifted version, or towing loaded most of the time, it's worth checking toe and camber to confirm everything is within factory tolerance.
There's no fixed spring rate to choose with this kit — air pressure between 5 and 100 PSI lets you adjust support to suit the load on any given trip. This means one kit covers both light day-to-day driving and fully loaded towing, without needing separate spring rate options.
This kit doesn't change wheel arch clearance on its own since it's fitted inside the existing rear coil spring, not a raised spring or lift kit. If you're chasing extra tyre clearance, you'll need a front lift kit and possibly the CR5133 rear-lifted configuration to keep the vehicle level — contact our team for a full fitment plan.
The air bag bladder is covered by Firestone's lifetime manufacturer warranty, which is a genuine trust point for Airbag Man products. Brackets and hardware carry standard manufacturer warranty terms — contact our team for the exact warranty documentation before you order.
Yes. Since air pressure is adjustable, you can run it low (around 5 PSI) for an unladen daily commute and increase it toward 100 PSI only when carrying a heavier load or towing. This flexibility is the main advantage over a fixed heavy-duty rear spring.
Help other 4WDSuspension users shop smarter by writing reviews for products you have purchased.
Add your favourites to cart
Log into or create your Afterpay account, with instant approval decision
Your purchase will be split into 4 payments, payable every 2 weeks
All you need to apply is to have a debit or credit card, to be over 18 years of age, and to be a resident of country offering Afterpay
Late fees and additional eligibility criteria apply. The first payment may be due at the time of purchase
For complete terms visit afterpay.com/terms
