Product Description
The AIR LIFT 88399 LoadLifter 5000 Ultimate Air Spring Kit delivers premium towing stability and load support for the 2017-2023 Ford Super Duty trucks equipped with 4WD. Designed for serious hauling and towing applications, this heavy-duty suspension upgrade provides up to 5,000 pounds of load-leveling capacity, helping eliminate rear suspension squat and maintain proper ride height when carrying heavy loads.
The LoadLifter 5000 Ultimate system features Air Lift’s exclusive internal jounce bumper, which creates a three-stage ride comfort system. This advanced design absorbs impacts and prevents bottoming out even when air pressure is low, providing added safety and ride comfort during heavy towing or hauling.
With adjustable air pressure ranging from 5-100 PSI, drivers can fine-tune the suspension to match their towing load or cargo weight. The AIR LIFT 88399 kit installs between the frame and rear leaf springs and includes air springs, mounting brackets, airlines, fittings, and installation hardware for a straightforward bolt-on installation.
Key Features
- Up to 5,000 lbs of load leveling capacity
- Internal jounce bumper prevents bottoming out
- Adjustable air pressure from 5-100 PSI
- Heavy-duty double convoluted air springs
- Improves towing stability and ride quality
- Reduces squat, trailer sway, and suspension sag
- Compatible with most fifth-wheel and gooseneck hitch systems
- Maintenance-free air spring design
- Limited lifetime warranty
Fitment
Vehicle Compatibility
- 2017 Ford F-250 Super Duty 4WD
- 2018 Ford F-250 Super Duty 4WD
- 2019 Ford F-250 Super Duty 4WD
- 2020 Ford F-250 Super Duty 4WD
- 2021 Ford F-250 Super Duty 4WD
- 2022 Ford F-250 Super Duty 4WD
- 2023 Ford F-250 Super Duty 4WD
- 2017 Ford F-350 Super Duty 4WD
- 2018 Ford F-350 Super Duty 4WD
- 2019 Ford F-350 Super Duty 4WD
- 2020 Ford F-350 Super Duty 4WD
- 2021 Ford F-350 Super Duty 4WD
- 2022 Ford F-350 Super Duty 4WD
- 2023 Ford F-350 Super Duty 4WD
- 2017 Ford F-450 Super Duty 4WD
- 2018 Ford F-450 Super Duty 4WD
- 2019 Ford F-450 Super Duty 4WD
- 2020 Ford F-450 Super Duty 4WD
- 2021 Ford F-450 Super Duty 4WD
- 2022 Ford F-450 Super Duty 4WD
- 2023 Ford F-450 Super Duty 4WD
Fits trucks equipped with rear leaf spring suspension. Compatible with most factory in-bed hitch systems, gooseneck hitches, and side-mount fifth-wheel hitch installations. Not compatible with cab-and-chassis models.
Specifications for AIR LIFT 88399
| Specification | Details |
|---|---|
| Brand | Air Lift |
| Part Number | 88399 |
| UPC | 729199883996 |
| GTIN | 729199883996 |
| Load Capacity | Up to 5,000 lbs |
| Air Pressure Range | 5-100 PSI |
| Air Spring Type | Double Convoluted Bellows |
| Mount Location | Rear Suspension |
| Shipping Weight | Approx. 35.4 lbs |
| Installation | Bolt-On Installation (no drilling required) |
| Prop 65 Warning | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ
How much load support does the Air Lift 88399 provide?
The LoadLifter 5000 Ultimate provides up to 5,000 pounds of load-leveling support to maintain proper ride height when towing trailers or hauling heavy cargo.
What makes the Ultimate series different from the standard LoadLifter 5000?
The Ultimate series includes an internal jounce bumper that provides additional shock absorption and prevents bottoming out even if the air springs lose pressure.
Can this system be paired with an onboard compressor?
Yes. Air Lift compressor systems such as WirelessAir or WirelessONE allow drivers to adjust air pressure directly from inside the cab.
Does this kit increase towing capacity?
No. Air spring kits improve suspension support and stability but do not increase the vehicle manufacturer’s GVWR or towing rating.
Will this work with fifth-wheel or gooseneck hitches?
Yes. The AIR LIFT 88399 is compatible with most factory and aftermarket in-bed towing hitch systems.
