Frequently Asked Questions About International 4700-4900 Drive Axle Springs & Hangers

Will these drive axle springs fit my specific International 4700 or 4900 model year?

These drive axle springs are designed to fit International 4700 and 4900 series trucks manufactured between 1989 and 2003. However, there are variations based on your truck's GVWR rating and suspension configuration. Before ordering, check your VIN plate for the suspension code or measure your existing spring's eye-to-eye length and arc height. Most 4700 models use a 44-inch spring, while 4900 models typically require a 48-inch spring, but always verify your specific measurements.

What's the difference between standard and heavy-duty spring options, and which do I need?

Standard springs are rated for trucks with GVWR up to 25,999 lbs and feature 10-12 leaves, while heavy-duty springs support GVWR of 26,000-33,000 lbs with 13-16 leaves. To determine which you need, check your door jamb sticker for GVWR rating or count the leaves in your current spring pack. If you frequently haul maximum loads or operate in severe conditions, consider upgrading to heavy-duty springs for improved stability and longer service life.

Can I replace just one spring, or do I need to replace both sides?

While it's technically possible to replace a single spring, we strongly recommend replacing springs in pairs. Mismatched springs can cause uneven ride height, poor handling, accelerated tire wear, and potential driveline vibration. Even if your other spring appears functional, it has likely experienced similar wear and fatigue. Replacing both ensures balanced performance and prevents comeback issues.

What additional parts will I need for installation?

A complete installation typically requires new U-bolts (specific to your axle diameter - usually 3-inch or 3.5-inch), spring bushings, shackle pins, and lock nuts. Many customers also replace worn hangers and shackles at this time. You'll need a spring compressor or hydraulic jack for safe installation, and we recommend having grade 8 hardware on hand. Budget 4-6 hours for DIY installation with proper tools, or 2-3 hours for professional installation.

How can I tell if my springs are OEM-style taper leaf or aftermarket multi-leaf?

OEM taper leaf springs have leaves that gradually decrease in thickness from the center to the ends, providing a progressive spring rate and smoother ride. Multi-leaf springs use uniform thickness leaves stacked together. Check your current springs - if the leaves appear to get thinner toward the ends, you have taper leaf. While multi-leaf replacements are less expensive, they may result in a stiffer ride. For maintaining original ride quality, choose OEM-style taper leaf replacements.