Frequently Asked Questions About Volvo VNL Gen III Air Springs & Level Valves

Will these air springs and level valves fit my specific Volvo VNL model year?

These air springs and level valves are designed specifically for Volvo VNL Generation III trucks, which include model years 2018 and newer. They are compatible with VNL 300, 400, 640, 740, 760, and 860 series. However, there are slight variations between early 2018 models and 2020+ models, particularly in mounting bracket design. Always verify your truck's VIN and production date before ordering, as some 2018 trucks may still have Gen II components.

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

Installation typically takes 2-4 hours per axle for experienced mechanics. You'll need basic hand tools, a 3/4" and 15/16" wrench for air line fittings, jack stands or a lift, and ideally an impact wrench. The most challenging part is often accessing the upper mounting bolts, especially on trucks with aftermarket exhaust systems. Many customers report needing to disconnect the shock absorber temporarily for better access. Professional installation is recommended if you're not comfortable working with air systems.

What's the difference between OEM and aftermarket air springs for my VNL?

OEM Volvo air springs typically use Continental ContiTech or Firestone materials with reinforced rubber compounds rated for 500,000+ miles. Aftermarket options vary widely in quality - premium brands like Firestone and Goodyear offer comparable performance at 20-30% less cost, while economy options may only last 200,000-300,000 miles. The main differences are in the rubber compound durability, crimp quality at the bead plates, and warranty coverage. OEM parts carry a 2-year unlimited mileage warranty, while aftermarket warranties range from 1-3 years.

How do I know if my level valve needs replacement versus just adjustment?

A properly functioning level valve should maintain ride height within 1/4 inch when loaded. Signs of failure include: truck leaning to one side, constant air bleeding from the valve, inability to maintain pressure overnight, or excessive bouncing. Before replacing, check the linkage adjustment - the arm should be parallel to the ground at proper ride height. If adjustment doesn't resolve the issue, or if you see physical damage, corrosion, or air leaks from the valve body itself, replacement is necessary. Level valves typically last 300,000-400,000 miles under normal conditions.

Can I upgrade to a different style or height air spring than what came factory?

While the mounting points are standardized, changing air spring styles or heights can affect ride quality, handling, and DOT compliance. Most VNL Gen III trucks come with either standard 9" diameter springs or heavy-haul 11" diameter springs. Upgrading from 9" to 11" springs requires verifying frame clearance and potentially modifying air lines. Height modifications beyond 1-2 inches typically require recalibrating the level valve linkage and may affect driveline angles. Always maintain factory ride height specifications to ensure proper suspension geometry and avoid premature u-joint or carrier bearing wear.