Overview
The AirLift Slam Air Plus adjustable air spring kit, part number AIR59209, is a rear air spring set for lowered trucks. The manufacturer fitment list covers the 1999–2014 Chevrolet Silverado 1500 and GMC Sierra 1500 in the trims shown below.
The kit is rated for up to 4000 lbs. of leveling capacity. It eliminates bottoming out, offers an adjustable spring rate for changing loads and gives a comfortable ride.
Key features
- Up to 4000 lbs. of leveling capacity
- Eliminates bottoming out, per the brand
- Adjustable spring rate for variable loads
- Comfortable ride for lowered trucks
- Easier and faster installation
Lowered trucks and spring rate
Lowered trucks often run with less clearance at the rear, so the bump stops and shocks see more load. Adjustable spring rate lets the support change with the cargo, which helps when the truck runs empty some days and loaded others. Check the clearance between the frame and axle at full compression before adjusting the springs.
Lowering also changes the geometry of the rear suspension, so check shock length and mounting positions after installation. Keep the truck raised and supported while working underneath, and check the bump stops for wear at each service. Tire condition and load rating deserve attention too, since added support changes how the tires carry weight. Routine inspection of the springs, mounts and fittings keeps the setup safe over time.
- Check clearance at full compression
- Inspect shock length after lowering
- Keep bump stops in good shape
Specifications
| Brand | AirLift |
|---|---|
| Part number | AIR59209 |
| Product | Slam Air Plus adjustable air springs |
| Leveling capacity | Up to 4000 lbs. |
| Position | Rear |
| Spring rate | Adjustable |
| Warranty | Limited lifetime |
| Included | Detailed instructions |
| Fitment type | Direct fit |
Vehicle fitment
The manufacturer fitment list includes the 1999–2014 Chevrolet Silverado 1500 in Base, High Country, Hybrid, LS, LT, LTZ, WT and XFE trims, and the 1999–2014 GMC Sierra 1500 in Base, Denali, HT, Hybrid, SL, SLE, SLT, WT and XFE trims.
Model years outside 1999–2014 and trucks not named on this list are not covered. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Detailed instructions come with the springs. Keep the truck raised and supported while you work underneath it.
What’s included
Detailed instructions are included. Count the springs and check the mounting hardware against your installation before starting.
