International WorkStar Leaf Springs-Hangers-Acc

Frequently Asked Questions About International WorkStar Leaf Springs, Hangers & Accessories

Will these leaf springs fit my specific WorkStar model year?

Our International WorkStar leaf springs are designed to fit models from 2008 through 2018. However, compatibility can vary based on your truck's configuration, including wheelbase, GVWR, and suspension type. We recommend checking your VIN or calling our tech support at 1-888-875-7787 with your truck's specifications to ensure proper fitment. Common variations include differences between single and tandem axle setups, as well as air ride versus spring suspension models.

What's the weight capacity difference between OEM and heavy-duty aftermarket leaf springs?

Stock International WorkStar leaf springs typically support between 12,000 to 20,000 lbs per axle depending on your model. Heavy-duty aftermarket options can increase capacity by 15-25%, with some rated up to 23,000 lbs. The actual improvement depends on factors like spring pack thickness, number of leaves, and material grade. For trucks regularly hauling at maximum capacity or experiencing sagging, upgrading to a multi-leaf heavy-duty pack with 8-10 leaves versus the standard 6-7 can significantly improve load handling and reduce maintenance intervals.

How difficult is the installation process and what tools are required?

Installing leaf springs on a WorkStar typically takes 3-5 hours per axle for experienced mechanics. Essential tools include a heavy-duty floor jack, jack stands rated for commercial trucks, impact wrench, torque wrench capable of 450-500 ft-lbs, and spring compressors. Critical steps include safely supporting the axle weight, removing U-bolts (often requiring penetrating oil due to corrosion), and torquing new hardware to specification - typically 300-350 ft-lbs for U-bolts. Many customers report the most challenging part is dealing with seized shackle pins and worn bushings, which may require cutting tools.

What's included in a complete leaf spring kit versus individual components?

Complete kits typically include the leaf spring assembly, U-bolts, center pins, and mounting hardware. However, shackles, hangers, and bushings are often sold separately. For a full suspension refresh on a WorkStar, you'll likely need the spring pack ($400-800 each), shackle kit ($150-250), hanger kit if worn ($200-350), and polyurethane or rubber bushings ($50-100). Many customers find that when replacing springs, the hangers and shackles also show significant wear and should be replaced to prevent premature spring failure.

How can I tell if my leaf springs need replacement versus just helper springs?

Signs your WorkStar needs new leaf springs include visible cracks in leaves, separated or broken leaves, permanent sagging when unloaded (more than 2 inches from original ride height), or excessive leaning to one side. If your truck sits level when empty but sags only under load, helper springs or air bags might suffice. Measure from the center of your wheel hub to the fender lip on both sides - a difference greater than 1 inch indicates spring fatigue. Also check for shiny wear marks between leaves, which indicate loss of arch and reduced load capacity.