Frequently Asked Questions About Peterbilt 375/377 Front Axle Air Ride Kits

Will these air ride kits fit my specific year Peterbilt 375 or 377?

Our front axle air ride kits are designed to fit Peterbilt 375 and 377 models from 1987 through 2007. However, there are variations between model years, particularly in trucks manufactured before 1995 which may have different frame rail spacing. We recommend checking your truck's VIN and confirming your front axle model (typically Dana Spicer I-Beam or Hendrickson) before ordering. If you're unsure about compatibility, our tech support team can help verify fitment with your specific truck details.

How difficult is the installation, and what tools will I need?

Installation typically takes 6-8 hours for experienced mechanics and 10-12 hours for DIY installers. You'll need standard shop tools including a floor jack, jack stands, impact wrench, torque wrench, and basic hand tools. The most challenging part is usually removing the existing leaf springs and aligning the new air bag mounts. Most kits include detailed instructions, but you'll need to drill 4-6 holes in the frame rails for mounting brackets. Professional installation runs $800-1,200 at most shops if you prefer not to tackle it yourself.

What's included in the complete kit, and will I need additional parts?

A complete front axle air ride kit includes air bags, mounting brackets, air lines, fittings, and hardware. However, you'll need to purchase separately: an air compressor (if your truck doesn't have one), air tank, pressure gauges, and a leveling valve. Some customers also upgrade to electronic height control systems for automatic leveling. Budget an additional $300-500 for these components if your truck isn't already equipped with rear air suspension.

How much weight capacity do these air bags provide, and how do they affect ride quality?

Most kits feature air bags rated between 5,000-7,500 pounds per bag, providing 10,000-15,000 pounds total front axle capacity. This matches or exceeds most factory leaf spring ratings. Drivers report significantly improved ride quality, with 60-80% reduction in cab bounce and vibration. The air suspension also maintains consistent ride height regardless of load, unlike leaf springs that sag over time. You can adjust air pressure to fine-tune ride firmness based on your load and road conditions.

What maintenance is required, and how long do these systems typically last?

Air ride systems require minimal maintenance compared to leaf springs. Check air pressure weekly, inspect air lines for leaks or damage during pre-trip inspections, and keep the air bags clean from road debris. The air bags typically last 100,000-150,000 miles with proper care, though this varies based on load weights and road conditions. Unlike leaf springs that gradually lose tension, air bags maintain consistent performance until replacement is needed. Most drivers find the improved ride quality and reduced driver fatigue worth the periodic air bag replacement cost of $200-300 per bag.