Keep your International 9900/i/ix truck running smoothly with durable leaf springs, hangers, and accessories. This product lineup offers high-quality parts designed for performance and longevity for the 9900 series trucks.
Shop top-grade leaf springs, heavy-duty suspension components, and accessories like shackles, bushings, and U-bolts. Whether replacing parts or upgrading your suspension system, this product lineup provides everything needed to enhance handling, stability, and ride comfort.
Frequently Asked Questions About International 9900/i/ix Leaf Springs, Hangers & Accessories
What years and models are these leaf springs compatible with?
Our leaf springs and hangers are designed specifically for International 9900, 9900i, and 9900ix models from 1987 through 2017. The 9900i models (2000-2004) and 9900ix models (2005-2017) share many of the same suspension components, but we recommend verifying your truck's specific VIN and suspension configuration before ordering. Front springs typically come in 3-leaf or 4-leaf configurations, while rear springs vary based on your truck's GVWR rating.
How difficult is the installation process, and what tools do I need?
Installing leaf springs requires moderate to advanced mechanical skills and typically takes 4-6 hours per axle. Essential tools include a heavy-duty floor jack, jack stands rated for commercial trucks, spring compressors, impact wrench, torque wrench capable of 450-500 ft-lbs, and proper safety equipment. Many customers report that removing rusted U-bolts and pins is the most challenging part. We strongly recommend having a helper and following proper safety procedures, as springs are under significant tension.
What's the difference between OEM and aftermarket springs in terms of quality and lifespan?
Quality aftermarket springs from reputable manufacturers often match or exceed OEM specifications at a lower cost. Look for springs made from 5160H spring steel with proper heat treatment and shot peening. OEM springs typically last 300,000-500,000 miles under normal conditions, and premium aftermarket options offer similar longevity. Key quality indicators include consistent arc height, proper bushing materials, and warranty coverage of at least 1 year.
How do I know when my leaf springs need replacement?
Common signs include visible cracks or breaks in the leaves, sagging that causes uneven ride height (measure from frame to ground on both sides), excessive bouncing or harsh ride quality, worn or missing bushings, and shifted or broken center bolts. A difference of more than 1 inch in ride height side-to-side typically indicates spring wear. Also check for leaves that have separated or show signs of metal fatigue like stress marks or discoloration.
What spring rate or capacity do I need for my specific application?
Spring capacity depends on your truck's configuration and typical loads. Standard front springs range from 12,000 to 14,600 lbs capacity, while rear springs vary from 40,000 to 52,000 lbs for tandem setups. Check your door jamb sticker for GAWR (Gross Axle Weight Rating) specifications. For heavy-haul applications or frequent maximum loads, consider springs rated 10-15% above your GAWR. Variable-rate or progressive springs offer better empty ride quality while maintaining full load capacity.
