Peterbilt 330/335/337 Leaf Springs, Hangers & Acc.

Frequently Asked Questions About Peterbilt 330/335/337 Leaf Springs, Hangers & Acc.

What years and specific models do these leaf springs fit?

Our leaf springs are designed for Peterbilt 330, 335, and 337 models from 2005 through 2015. However, compatibility can vary based on your truck's configuration, including wheelbase and suspension type. We recommend checking your OEM or calling us with your truck's specifications to ensure proper fitment. Note that some springs are side-specific (driver or passenger), so double-check before ordering.

What's the difference between OEM and aftermarket leaf springs in terms of quality and lifespan?

OEM leaf springs typically use higher-grade steel and undergo more rigorous testing, often lasting 200,000-300,000 miles under normal conditions. Quality aftermarket options can perform similarly at a lower price point, but durability varies by manufacturer. Look for springs with shot-peened surfaces and proper heat treatment. Budget aftermarket springs may sag prematurely or develop stress cracks after 100,000-150,000 miles, especially under heavy loads.

Do I need special tools or equipment to replace leaf springs and hangers?

Yes, leaf spring replacement requires specific tools including heavy-duty jack stands (minimum 10-ton capacity), a floor jack, spring compressors, and impact wrenches. You'll also need penetrating oil for rusty bolts and proper torque specifications (typically 150-200 ft-lbs for U-bolts). Many customers find the front springs manageable but struggle with rear multi-leaf packs due to their weight and tension. Professional installation typically takes 3-4 hours per axle.

How do I know when my leaf springs need replacement versus just new bushings or hangers?

Check for these signs: visible cracks or breaks in the leaves, excessive sagging (measure ride height against factory specs), separated or shifted leaves, or a rough ride even with good shocks. Often, worn bushings cause similar symptoms like wandering or clunking noises. If your springs look intact but you have handling issues, try replacing bushings first (about $50-100) before investing in new springs ($300-600 per spring).

What weight capacity should I choose, and how does it affect ride quality?

Stock Peterbilt 330/335/337 springs typically range from 12,000 to 20,000 lbs capacity per axle. Heavier-rated springs provide better support for consistent heavy loads but create a stiffer, rougher ride when empty. If you frequently run mixed loads, consider progressive-rate springs that offer a balance. Going too light risks bottoming out and premature wear, while overrated springs can cause excessive bouncing and poor tire contact.