Frequently Asked Questions About Kenworth T680 Air Springs & Level Valves

What years of Kenworth T680 do these air springs and level valves fit?

Our air springs and level valves are designed to fit Kenworth T680 models from 2013 to present. However, there can be variations based on your specific truck configuration, suspension type (Airglide vs. AG400), and whether you have a day cab or sleeper model. We recommend checking your truck's VIN or contacting our support team with your specific year and model details to ensure proper fitment.

How difficult is it to install replacement air springs on my T680, and what tools do I need?

Installing air springs typically takes 2-4 hours per axle for someone with moderate mechanical experience. You'll need basic hand tools, jack stands, and ideally an air impact wrench. The most challenging part is often accessing the top mounting bolts, especially on sleeper models. Many customers report needing to remove the inner fender liner for better access. Always ensure the truck is properly supported and the air system is fully depressurized before beginning installation.

How long do aftermarket air springs typically last compared to OEM parts?

Quality aftermarket air springs from reputable manufacturers like Firestone and Continental can match or exceed OEM lifespan, typically lasting 200,000-300,000 miles under normal operating conditions. The key factors affecting longevity are proper installation, maintaining correct air pressure (usually 60-100 PSI depending on load), and regular inspection for damage from road debris. Many drivers report getting 2-3 years of reliable service from quality aftermarket options.

What are the signs that my level valve needs replacement, not just my air springs?

A faulty level valve often causes the truck to lean to one side, maintain incorrect ride height, or experience slow air leaks that only occur when parked. If your air springs hold pressure when disconnected but lose air when connected to the system, or if your truck won't maintain proper ride height even with new air springs, the level valve is likely the culprit. Additionally, if you notice excessive cycling of your air compressor or uneven tire wear, these can indicate level valve issues.

Do I need to replace air springs in pairs, or can I replace just one?

While it's possible to replace a single air spring, we strongly recommend replacing them in pairs (both sides of the same axle). Air springs lose elasticity over time, and mixing new with old can cause uneven ride height, poor handling, and premature wear on the new spring. The cost difference is minimal when considering the improved ride quality and preventing a second installation labor charge when the other spring inevitably fails.