Peterbilt 379 Steer Axle Springs & Hangers

Frequently Asked Questions About Peterbilt 379 Steer Axle Springs & Hangers

What is included in this category, and how do I know I need these parts?

This category covers front (steer axle) leaf springs and the spring hangers that mount them to the frame of a Peterbilt 379. If you're noticing uneven ride height, sagging on one side, cracked or shifted leaves, excessive front-end bounce, or a hanger that is cracked, bent, or worn at the bushing bore, it's a good sign that your springs, hangers, or both need to be replaced.

How do I make sure a spring or hanger will fit my specific 379?

Steer axle spring and hanger specs can vary by front axle rating, wheelbase, and suspension setup, even within the same model year range. Always check the part's listed axle capacity, spring length, arch, and leaf count against your truck's build sheet or the components you're replacing, and reach out to our parts team with your VIN or axle tag information if you're unsure before ordering.

Should I replace the hangers at the same time as the springs?

If your hangers show cracking, elongated bushing bores, rust-through, or visible metal fatigue, they should be replaced along with the springs rather than reused. Even if damage isn't obvious, hangers that have been in service for many years alongside a failed spring are often stressed as well, so a visual and physical inspection at the time of the repair is worth doing.

What material and finish do these springs and hangers come in?

Steer axle leaf springs are typically constructed from heat-treated alloy steel to handle the front-end load and road impact, while hangers are usually cast or forged steel. Finishes range from raw or painted steel to powder-coated or e-coated options depending on the manufacturer, which affects corrosion resistance in different climates and road conditions.

Can I install a steer axle spring or hanger myself, or should a professional handle it?

Steer axle spring and hanger replacement involves supporting the front axle safely, removing U-bolts and hanger bolts under load, and properly torquing all fasteners afterward, so it's a job that requires a lift, jack stands, and the right tools. Many owner-operators with mechanical experience do this work themselves, but if you're not confident working around a loaded front axle, it's best to have a qualified truck repair shop handle the install to keep your steering and alignment safe and accurate.