- Home
- Freightliner Parts
- Freightliner Classic 120/132 XL Parts
- Freightliner Classic Frame & Chassis
- Freightliner Classic Air Springs & Level Valves
Freightliner Classic Air Springs & Level Valves
Frequently Asked Questions About Freightliner Classic Air Springs & Level Valves
Will these air springs fit my specific Freightliner Classic model year?
Our air springs are designed to fit Freightliner Classic models from 1990 through 2007. However, there are variations between different configurations (daycab vs. sleeper, single vs. tandem axle). Always verify the OEM part number on your existing air spring or contact our support team with your VIN to ensure proper fitment. Most common applications include the W01-358-7878 for drive axles and W01-358-9601 for front suspensions.
How difficult is it to replace air springs and level valves myself?
Air spring replacement typically takes 1-2 hours per side for experienced DIYers. You'll need basic hand tools, jack stands, and ideally an air compressor to test the system. The most challenging part is often accessing the top mounting bolts in tight spaces. Level valve replacement requires careful adjustment after installation - the linkage arm must be set to maintain proper ride height. We recommend having a shop manual or watching installation videos before starting. Always support the frame properly and release air pressure before beginning work.
What's the difference between OEM and aftermarket air springs for my Classic?
OEM air springs like Firestone and ContiTech typically last 200,000-300,000 miles under normal conditions. Quality aftermarket options from brands we carry offer similar durability at 20-30% less cost. The main differences are in rubber compound formulations and crimp ring designs. Avoid extremely cheap options as they often use thinner rubber that can fail prematurely. Look for air springs with steel girdle rings and multi-ply construction for best longevity.
How do I know if my level valve needs replacement or just adjustment?
A properly functioning level valve should maintain consistent ride height regardless of load. Signs of failure include: truck leaning to one side, constant air loss from leveling valve exhaust, or inability to maintain height after loading. Before replacing, check the linkage for bent rods or loose connections. Many issues are solved by adjusting the arm angle - it should be parallel to the ground at proper ride height. If adjustment doesn't help or the valve is visibly leaking, replacement is necessary.
Can I upgrade to a different style air spring than what came factory?
Yes, but compatibility depends on your suspension type. Rolling lobe style air springs can often replace reversible sleeve types if mounting dimensions match. Popular upgrades include switching from standard 1R11-221 bags to heavy-duty 1R12-373 for increased load capacity. However, never mix different air spring styles on the same axle, and ensure your level valve can handle any capacity changes. Some upgrades may require different mounting brackets or height control modifications.