Frequently Asked Questions About Peterbilt 359 Air Springs & Level Valves

What years do these air springs and level valves fit on a Peterbilt 359?

Our air springs and level valves are designed to fit Peterbilt 359 models from 1967 through 1987. However, there were minor suspension variations throughout production years, particularly between pre-1973 and post-1973 models. We recommend checking your truck's specific suspension type (Hendrickson, Neway, or Reyco) before ordering, as mounting brackets and air spring dimensions can vary. If you're unsure about compatibility, contact us with your VIN or suspension model number.

How difficult is it to install air springs and level valves on my 359?

Installation typically takes 2-4 hours per axle for someone with basic mechanical skills. The most challenging aspects are safely supporting the truck frame while removing old components and ensuring proper air line routing. You'll need standard hand tools, jack stands rated for commercial vehicles, and potentially an impact wrench for stubborn bolts. Level valve installation requires careful adjustment to maintain proper ride height - we include detailed instructions with each kit. Many customers report that having a helper makes the job much easier, especially when positioning the heavier components.

What's the difference between single and dual convoluted air springs?

Single convoluted air springs offer a firmer ride and are typically rated for standard highway applications up to 20,000 lbs per axle. Dual convoluted springs provide a softer, more cushioned ride and handle heavier loads up to 23,000 lbs per axle. Double convoluted designs also offer better stability under varying load conditions. Most long-haul operators prefer dual convoluted for comfort, while vocational trucks often use single convoluted for their durability and responsiveness. Your choice should match your typical payload and driving conditions.

How long do aftermarket air springs and level valves typically last?

Quality aftermarket air springs generally last 150,000 to 250,000 miles under normal highway conditions, with proper maintenance. Level valves can last even longer - often 300,000+ miles. Lifespan depends heavily on operating conditions: rough roads, overloading, and exposure to road chemicals will shorten service life. Regular inspections for air leaks, checking for rubber degradation, and keeping components clean from road debris will maximize longevity. We carry both economy and premium brands - premium options typically offer 30-40% longer service life.

My truck sits uneven after installing new components - what should I check?

Uneven ride height after installation usually stems from improper level valve adjustment or air pressure differences between sides. First, ensure both air springs are receiving equal pressure (typically 60-80 PSI when loaded). Check that level valve linkages are adjusted to the same length on both sides and move freely without binding. Verify the level valve mounting brackets are at identical heights. If the problem persists, inspect for damaged air lines, stuck check valves, or a malfunctioning height control valve. Sometimes frame settling or worn suspension bushings can also cause persistent lean issues unrelated to the air system.