Peterbilt 359 Shock Absorbers

Frequently Asked Questions About Peterbilt 359 Shock Absorbers

Will these shock absorbers fit my specific year Peterbilt 359?

Most aftermarket shock absorbers for the Peterbilt 359 are designed to fit models from 1967 through 1987. However, there can be variations depending on whether your truck has been modified with different suspension setups or lift kits. We recommend checking the shock's extended and compressed lengths against your current setup. Standard front shocks typically measure 19-21 inches extended and 12-13 inches compressed, while rear shocks measure 26-28 inches extended and 16-17 inches compressed.

What's the difference between standard and heavy-duty shock absorbers for my 359?

Standard shocks work well for highway driving and lighter loads, featuring single-tube construction with basic valving. Heavy-duty options use twin-tube designs with larger pistons and upgraded valving to handle heavier loads, rough terrain, and frequent stop-and-go driving. If you regularly haul maximum weight loads or drive on rough roads, heavy-duty shocks will provide better control and last longer. They typically feature larger 1.75-2 inch bodies compared to standard 1.5 inch bodies.

Can I install these shock absorbers myself, or do I need special tools?

Installation is straightforward for most mechanics with basic tools. You'll need jack stands, a floor jack, basic hand tools, and potentially a spring compressor for front shocks if your 359 has coil springs. The main challenge is accessing the upper mounting bolts, especially on the front. Many drivers report the job takes 2-3 hours for all four shocks. Always replace shocks in pairs (both fronts or both rears) to maintain balanced handling.

How do I know when my Peterbilt 359 shock absorbers need replacement?

Common signs include excessive bouncing after hitting bumps (more than 2-3 oscillations), nose diving during braking, uneven tire wear, visible oil leaks on the shock body, or a rough, unstable ride. Most shock absorbers last 50,000-75,000 miles under normal conditions, but heavy hauling or rough roads can reduce this to 30,000-40,000 miles. If your truck leans excessively during turns or feels unstable at highway speeds, worn shocks are often the culprit.

Should I upgrade to air shocks or stick with traditional hydraulic shocks?

Traditional hydraulic shocks are reliable, affordable, and perfect for most 359 applications. Air shocks offer adjustable ride height and stiffness, which is beneficial if you haul varying loads or want to level your truck when loaded. However, air shocks require additional components like air lines and valves, cost 2-3 times more than hydraulic shocks, and need more maintenance. Unless you specifically need adjustability, quality hydraulic shocks will serve you well and are easier to maintain.