Frequently Asked Questions About Kenworth W900A Drive Axle Springs & Hangers

What years and models of Kenworth W900A are these drive axle springs and hangers compatible with?

Our drive axle springs and hangers are designed to fit Kenworth W900A models from 1961 through 1985. However, compatibility can vary based on your specific axle configuration and suspension type. We recommend checking your truck's VIN and confirming the original suspension specifications before ordering. Common configurations include Hendrickson walking beam and Neway air ride systems. If you're unsure about fitment, our technical support team can help verify compatibility with your specific year and model.

Are these springs made from OEM-spec materials, and how long can I expect them to last?

Our replacement springs are manufactured using high-grade spring steel that meets or exceeds OEM specifications. Most springs feature shot-peened construction for enhanced durability and fatigue resistance. Under normal operating conditions with proper maintenance, you can expect 150,000 to 250,000 miles of service life. Heavy-duty applications or severe service conditions may reduce lifespan. We recommend regular inspections for cracks, corrosion, or unusual wear patterns, especially if you frequently haul maximum loads.

What tools and equipment do I need for installation, and how difficult is the job?

Installing drive axle springs and hangers requires heavy-duty equipment including a minimum 20-ton jack, heavy-duty jack stands, spring compressors, and standard mechanics tools. You'll also need torque wrenches capable of 450-500 ft-lbs for proper U-bolt installation. This is typically a 4-6 hour job for experienced mechanics. Critical safety warning: Never attempt this installation without proper spring compressors, as springs under load can cause serious injury. Many customers opt for professional installation due to the specialized tools and safety considerations involved.

Do I need to replace springs and hangers together, or can I replace them separately?

While you can technically replace springs and hangers separately, we strongly recommend replacing them as a complete set. Worn hangers can cause premature spring failure, and new springs on worn hangers often result in improper alignment and uneven tire wear. Additionally, labor costs are nearly identical whether replacing one component or both. Replacing the complete assembly ensures proper geometry, reduces comeback issues, and typically provides better long-term value.

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

Standard springs are rated for typical highway hauling and general freight applications, usually supporting 20,000-23,000 pound axle ratings. Heavy-duty springs are designed for severe service, off-road use, or consistently heavy loads, supporting up to 30,000 pound axle ratings. To determine which you need, check your door jamb sticker for GAWR (Gross Axle Weight Rating) or consult your original build sheet. Using under-rated springs will cause premature failure and unsafe handling, while over-rated springs can create a harsh ride when running empty.