Rear Air Suspension Kit for 1999-2018 Chevrolet/GMC 1500 | SPELAB

Stop the Squat. Turn Your Half-Ton into a Towing Powerhouse.

Your 1999-2018 Chevrolet Silverado & GMC Sierra 1500 is a legendary truck, but its factory leaf springs were built for a compromise between ride comfort and light hauling. When you load up the bed with heavy cargo or hitch up a travel trailer, the rear end sags. This terrifying "truck squat" causes your front tires to lose traction, your steering to become dangerously light, and your headlights to blind oncoming traffic. Worse yet, every bump in the road results in a bone-jarring bottom-out.

Level Your Load with SPELAB's 7,500-LB Heavy-Duty Air Suspension.
Engineered for truck owners who demand more stability, this premium air helper spring kit acts as a muscular support system for your factory suspension. Fully adjustable from 0 to 150 PSI, these extreme-duty air bags effortlessly level up to 7,500 pounds of payload.

By restoring your Silverado's proper ride height, this kit eliminates trailer sway, body roll, and harsh bottoming out. Get your steering geometry back, protect your tires, and experience a smooth, confident towing experience—whether you are pulling a camper on the weekend or hauling supplies to the job site.

Fitment

• 1999-2018 Chevrolet Silverado 1500
• 1999-2018 GMC Sierra 1500

Key Benefits

• Massive 7,500 LBS Load-Leveling Capacity
  Engineered to support significantly more weight than standard 5,000-lb aftermarket kits. Effortlessly levels heavy travel trailers, boat trailers, or fully loaded truck beds, restoring a safe and level stance to your half-ton truck.

• Eliminates "Truck Squat" & Trailer Sway
  Automatically adjusts your ride height to counteract heavy rear payloads. Keeps your front tires firmly planted on the road for precise steering, safe braking distances, and proper headlight alignment.

• Extreme-Duty 6mm Thick Rubber
  Constructed from multi-layer reinforced rubber boasting an impressive 5.9-6.0mm thickness. Provides incredible resistance to road debris, abrasions, and leaks, ensuring long-lasting reliability in harsh towing environments.

• Fully Adjustable Air Pressure (0-150 PSI)
  Inflate when heavily loaded and deflate when riding empty. Gives you total control to fine-tune your suspension stiffness for a buttery-smooth ride, whether you are hauling a tractor or cruising to the grocery store.

• Maximum Air Volume for Comfort
  Designed intentionally without an internal jounce bumper. Maximizes the internal air volume of the bag, which creates a softer, more dynamic pneumatic cushion to absorb harsh road impacts and reduce driver fatigue.

• Ultra-High Burst Pressure Safety
  While the maximum daily operating pressure is 150 PSI, these bags boast a laboratory-tested burst pressure of 435 PSI (3 MPa). Gives you absolute peace of mind that your air bags won't blow out under sudden impacts or severe compression.

Product Specifications

Ideal Usage Scenarios

• Travel Trailers & Boats: Eliminates the aggressive rear-end sag caused by heavy tongue weights, stopping porpoising (bouncing) on the highway.

• Contractors & Work Trucks: Keeps your truck level when the bed is loaded with heavy tools, lumber, or gravel, preventing premature factory leaf spring wear.

• Daily Driving: Provides a smooth, comfortable ride for passengers. When empty, simply lower the pressure to 5 PSI to retain factory ride quality.

Q: Does this kit increase my Silverado's maximum towing capacity (GVWR)?
A: No. Air suspension kits are designed to level and support the load, making it safer and more comfortable to carry. You should never exceed the factory-rated maximum Gross Vehicle Weight Rating (GVWR) or payload capacity set by Chevrolet.

Q: Do these bags have an internal jounce bumper?
A: No. These air springs are intentionally designed without an internal jounce bumper. This allows for a larger internal air volume, which results in a smoother, less jarring ride quality when towing. Note: You must maintain a minimum of 5 PSI in the bags at all times to prevent them from bottoming out and tearing.

Q: What is the maximum pressure I can run?
A: The recommended maximum operating pressure is 150 PSI. While these heavy-duty bags are tested to withstand a burst pressure of 435 PSI (3 MPa), you must strictly adhere to the 150 PSI limit for safe, daily operation.

Q: Will this fit my GMC Sierra 1500?
A: Yes. The 1999-2018 Chevy Silverado 1500 and GMC Sierra 1500 share the identical GMT800 chassis platform, meaning this kit will bolt up perfectly to either truck.

Q: Will this make my truck ride stiff when the bed is empty?
A: Not at all! The beauty of adjustable air springs is that you can deflate them to the minimum 5 PSI when you are not hauling. Your truck will ride smoothly on its factory suspension just like it did before the installation.