Peterbilt 567/579 Leaf Springs, Hangers & Acc.

Frequently Asked Questions About Peterbilt 567/579 Leaf Springs, Hangers & Acc.

Will these leaf springs fit both my Peterbilt 567 and 579 models, and what years are compatible?

Most leaf springs and hangers in this category are designed to fit Peterbilt 567 models from 2013-present and 579 models from 2012-present. However, compatibility can vary based on your truck's specific configuration, including wheelbase, suspension type (air-ride vs. spring), and whether you have a set-forward or set-back front axle. Always verify your truck's VIN and suspension specifications before ordering, as some components are model-specific despite the similar chassis design.

What's the difference between OEM and aftermarket leaf springs, and which should I choose?

OEM leaf springs are manufactured to Peterbilt's exact specifications and typically use premium spring steel with factory heat treatment processes. Aftermarket options often provide comparable performance at 30-40% less cost, though quality varies by manufacturer. Heavy-duty aftermarket springs from reputable brands like Dayton Parts or Triangle Suspension Systems often exceed OEM durability for vocational applications. For highway use, either option works well, but for severe-duty applications like logging or construction, consider heavy-duty aftermarket springs with additional leaves or higher weight ratings.

Can I install leaf springs and hangers myself, or do I need special tools?

While leaf spring replacement is possible for experienced mechanics, it requires specific tools including a heavy-duty floor jack (minimum 20-ton capacity), jack stands rated for commercial trucks, spring compressors, and torque wrenches capable of 450-500 ft-lbs. The job typically takes 4-6 hours per side and requires safely supporting the frame while removing tension from the old springs. Many customers report that improper installation leads to premature wear and alignment issues, so professional installation is recommended unless you have commercial truck experience and proper equipment.

How do I know when my leaf springs or hangers need replacement?

Common signs include visible cracks in spring leaves, excessive rust or corrosion, sagging on one side of the truck (more than 1-inch difference side-to-side), broken or shifted center bolts, worn bushings causing metal-on-metal contact, or unusual tire wear patterns. Hangers should be inspected for cracks around bolt holes, bent brackets, or excessive play in the bushings. Most operators report spring life of 300,000-500,000 miles under normal highway conditions, but severe-duty applications may require replacement at 150,000-200,000 miles.

What additional components should I replace when changing leaf springs?

When replacing leaf springs, it's recommended to also replace spring pins and bushings, U-bolts, and center bolts as these wear items directly affect spring performance and alignment. Shock absorbers should be inspected and replaced if showing signs of leakage or reduced damping. Many customers report that replacing only the springs without addressing worn hangers or bushings results in continued suspension problems and premature spring failure. Budget an additional $200-400 per side for these wear components to ensure proper suspension function.