Frequently Asked Questions About Peterbilt 330/335/337 Front Axle Air Ride Kits
What years and models are these air ride kits compatible with?
These front axle air ride kits are designed specifically for Peterbilt 330, 335, and 337 models from 2005 through 2024. They're engineered to work with both single and tandem rear axle configurations. However, compatibility can vary based on your truck's specific suspension setup and GVWR rating. We recommend checking your current suspension specifications before ordering, or contact our tech support team with your truck details for verification.
How difficult is the installation process, and what tools are required?
Installation typically takes 4-6 hours for experienced mechanics and 6-8 hours for DIY installers. You'll need standard shop tools including impact wrenches, jack stands rated for commercial vehicles, torque wrenches, and basic hand tools. The kit includes detailed instructions, but you'll need to safely support the truck frame and remove the existing leaf spring setup. Many customers report that having a second person helps significantly, especially when positioning the air bags. Professional installation runs $1400-$1800 depending on your location.
What's included in the complete kit, and are there any additional parts needed?
Each kit includes heavy-duty air bags, mounting brackets, air lines, fittings, and installation hardware. However, you'll need to purchase separately: an on-board air compressor system (if your truck doesn't have one), air tank, pressure gauges, and control valves for cab adjustment. Some installations may require additional air line or fittings depending on your preferred routing. Budget an extra $300-$500 for these components if you're starting from scratch.
How much weight capacity and ride improvement can I expect?
These air ride kits typically support 12,000 to 14,000 pounds per axle, depending on the specific model. Drivers report 60-70% reduction in cab bounce and vibration compared to leaf springs, with the most noticeable improvement on rough roads and job sites. The adjustable air pressure allows you to fine-tune ride quality based on load weight, with most operators running 60-80 PSI for optimal performance. Empty truck ride quality sees the most dramatic improvement.
What maintenance is required, and how long do these systems last?
Air ride systems require minimal maintenance - mainly checking air pressure weekly and inspecting air lines and fittings for leaks every 3 months. The air bags themselves typically last 100,000-150,000 miles with proper use. Keep them inflated to at least 20 PSI even when parked long-term to prevent damage. Most common issue is air line chafing, which is preventable with proper routing and protection during installation. Plan to replace air bags every 5-7 years under normal commercial use.
