Peterbilt 359 Drive Axle Springs & Hangers

Frequently Asked Questions About Peterbilt 359 Drive Axle Springs & Hangers

What is the difference between drive axle springs and hangers, and why do I need both?

Drive axle springs are the leaf spring assemblies that support the weight of the truck and axle while absorbing road shock, while hangers are the mounting brackets that attach those springs to the frame rail. Both components work together as part of the suspension system, so when one is worn or damaged, the other is often inspected and replaced at the same time to maintain proper ride height, alignment, and load support.

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

Common signs include sagging or uneven ride height, cracked or broken leaves, excessive cab or trailer bounce, unusual clunking or squeaking noises over bumps, and visible rust, cracking, or metal fatigue on the hanger brackets. If you notice the truck pulling to one side or uneven tire wear on the drive axle, it is a good idea to have the suspension inspected.

Will these springs and hangers fit my specific Peterbilt 359 configuration?

Fitment can vary depending on your truck's suspension type, axle rating, and model year, so it is important to check the listed specifications and compare them to your current parts before ordering. If you are unsure, having your VIN or the part numbers from your existing components on hand will help ensure you select the correct replacement.

Can I install these parts myself, or should I have a professional do it?

Replacing drive axle springs and hangers involves working with heavy components under load and often requires proper lifting equipment, torque specifications, and alignment checks afterward. While experienced heavy-duty mechanics may be comfortable handling this job in a shop setting, most owner-operators without the right tools and lift capacity choose to have a qualified truck repair shop complete the installation to ensure everything is properly seated and torqued.

Are these springs and hangers new, remanufactured, or used, and what kind of finish do they come in?

Product condition and finish vary by listing, so be sure to check each product page for details on whether the part is new or reconditioned, as well as whether it comes with a painted, primed, or bare metal finish. If corrosion resistance is a priority for your application, look for finish details in the product description before purchasing.