Reviewed by Andrew, 4WD Suspension fitment team
The Airbag Man Helper Kit for the Nissan Navara D40 2006-2015 stops rear-end sag under load, mounting heavy-duty rubber airbags between the rear leaf springs and chassis. Adjustable air pressure lets you restore factory ride height and correct suspension geometry on demand when towing or carrying weight, then drop back for unloaded comfort. Choose from 3 options in the dropdown: Standard - Leaf Over Axle (RR4656); Raised - Leaf Over Axle (RR4742); Standard - RX Leaf Under Axle 2010-15 (RR4631). Backed by a lifetime manufacturer's warranty on the air springs, in stock in Australia with expert fitment support.
Airbag Man helper kits use heavy-duty rubber bellows that mount between the chassis and the leaf pack – 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.
Doing the whole vehicle at once? We also stock the matching rear Leaf Springs and front Coil Springs for the Nissan Navara D40 2006-2015.
Browse all compatible suspension parts for your Nissan Navara D40 2006-2015 using our parts finder.
Pick a Standard Height kit if your Nissan Navara D40 is at factory ride height. Pick a Raised kit if the vehicle runs a suspension lift — raised kits are built for the greater distance between the suspension and chassis so the air spring operates in its correct working range.
The kit bolts between the rear leaf springs and chassis rails using the supplied brackets - no cutting or welding on standard installations. Air lines route to inflation valves (commonly mounted at the rear bar) so each side adjusts independently. Run minimum pressure unloaded and increase pressure to level the vehicle when towing or loaded. An optional onboard air control kit lets you adjust pressures from the cabin.
| Make | Model | Series | Years | Configuration |
|---|---|---|---|---|
| Nissan | Navara | D40 4x4 & 4x2 (leaf over axle) | 2006 - 2015 | Ute |
| Nissan | Navara | D40 4x2 Dual Cab RX (leaf under axle) | 2010 - 2015 | Ute |
Most D40s run leaf springs OVER the axle; the 4x2 Dual Cab RX (2010-15) runs them UNDER the axle and needs the RR4631 kit.
Not sure which kit you need? Contact our suspension experts and we can confirm the right part from your rego.
How To Install: Nissan D40 Navara Air Suspension - RR4656 Airbag Man Leaf Helper Kit
Last updated: 9 September 2026
Genuine Airbag Man suspension from an authorised Australian dealer.
New to Navara suspension? Read our Navara suspension problems guide.
| Specification | Detail |
|---|---|
| Kit type | Leaf spring air helper kit (mounts between the chassis and the leaf pack) |
| Position | Rear axle |
| Part RR4656 | up to 50 psi; operating height 5.5" - 6.5" |
| Part RR4742 | up to 50 psi; operating height 6.0" - 7.0" |
| Part RR4631 | 10 psi - 80 psi; operating height 7.75" - 8.75" |
| Typical fitting time | 120 minutes |
| Fitting notes (Airbag Man) | Easy Fit Kit |
| Kit contents | 2 x Airbag Man air springs, upper and lower brackets, mounting hardware, air line tubing, push-in fittings, 2 x inflation valves and step-by-step fitting instructions. |
| Warranty | Airbag limited lifetime manufacturer's warranty on the air springs |
Figures from Airbag Man product data. Helper kits assist the springs and do not change the vehicle's GVM or towing capacity.
It fits the Nissan Navara D40 4x4 & 4x2 (leaf over axle) 2006 - 2015 and Nissan Navara D40 4x2 Dual Cab RX (leaf under axle) 2010 - 2015. Most D40s run leaf springs OVER the axle; the 4x2 Dual Cab RX (2010-15) runs them UNDER the axle and needs the RR4631 kit. Contact us with your rego if you are unsure and we will confirm the exact kit.
This is a helper kit, not a lift kit - it does not raise your vehicle at ride height. Its job is to stop the rear sagging under load: inflating the air springs restores factory ride height when towing or carrying weight, then you drop pressure back for unloaded driving.
You get two heavy-duty air springs (double-convoluted rubber airbags with mounting brackets), air line, inflation valves, fittings and mounting hardware for a bolt-in installation on the rear axle. Exact contents vary slightly by part number - the product photo shows the selected kit.
Most D40s run leaf springs OVER the axle; the 4x2 Dual Cab RX (2010-15) runs them UNDER the axle and needs the RR4631 kit.
No. The kit includes inflation valves, so you can set pressure at a servo or with a portable 12V compressor. An onboard air control kit only adds in-cab adjustment.
No. The kit supports the suspension under load but does not raise GVM or towing capacity, and the vehicle must stay within the manufacturer's ratings. It is a bolt-in accessory.
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