Peterbilt 387 Steer Axle Springs & Hangers

Frequently Asked Questions About Peterbilt 387 Steer Axle Springs & Hangers

What do steer axle springs and hangers actually do on my Peterbilt 387?

The steer axle springs support the weight of the front end of the truck and absorb road shock, while the hangers are the mounting brackets that secure the springs to the frame. Together, they keep the front suspension properly aligned, maintain ride height, and help ensure predictable steering and handling.

How do I know if my springs or hangers need to be replaced?

Common signs include uneven ride height on one side of the truck, excessive front-end sway or vibration, cracked or sagging leaf springs, cab-over noise when going over bumps, and visible rust, cracks, or worn mounting bushings on the hanger itself. If you notice uneven tire wear or the truck pulling to one side, it is worth having the front suspension inspected.

Will these springs and hangers fit my specific Peterbilt 387 configuration?

Steer axle springs and hangers are typically matched to the truck's specific axle weight rating, wheelbase, and front suspension setup, so fitment can vary even within the same model. Always check the part number and specifications against your truck's axle rating and existing components before ordering, and reach out to our team if you are unsure which part matches your configuration.

Can I install steer axle springs and hangers myself, or should I have a shop do it?

Replacing steer axle springs and hangers involves supporting the front axle, removing u-bolts and mounting hardware, and properly torquing components back into place to manufacturer specifications. Because this is a safety-critical part of the steering and suspension system, we recommend having the work done by a qualified technician with the proper lifting equipment and torque specs, especially if you are not experienced with heavy-duty suspension work.

What materials are these springs and hangers made from, and does that affect durability?

Steer axle springs are generally made from tempered steel designed to handle repeated flexing and load-bearing stress, while hangers are typically cast or forged steel for strength and long-term durability. Look for components with a quality finish or coating to help resist rust and corrosion, particularly if the truck operates in areas with road salt or heavy moisture exposure.