Symptoms
The rear sags or bottoms out once a camper shell, bed rack, rooftop tent or trailer is added. Payload is as low as 1,105 lb on a 2020 Sport automatic with 3.73 gears, per Stellantis's specification sheet.
The fix, step by step
- Weigh the loaded truck at a scale first.
- Then fit coils rated for the load: support the frame, unbolt the shocks, sway-bar links and brake-line brackets, lower the axle carefully, swap the coils and isolators, and refit at ride height before torquing the bushings.
- Check the rear track bar and driveshaft angle afterwards, and re-aim the headlights.
Tools & part numbers
- Floor jack and stands
- sockets
- torque wrench
- access to a vehicle scale
Where to buy the parts
Rancho RS80139 rear heavy-duty progressive coil pair, Gladiator JTQuadratec ↗Amazon ↗
ICON 22066 rear multi-rate coil springs, Gladiator JTQuadratec ↗Amazon ↗
TeraFlex rear 3.5 in lifted coil springs, Gladiator JTQuadratec ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Jeep Gladiator JT parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.