Frequently Asked Questions About Freightliner FLC120 Drive Axle Springs & Hangers

What years and models of Freightliner FLC120 are these drive axle springs compatible with?

Our drive axle springs and hangers are designed to fit Freightliner FLC120 models from 1989 through 2003. However, compatibility can vary based on your specific axle configuration and suspension type. We recommend checking your truck's VIN or contacting our support team with your truck's specifications to ensure proper fitment. Most applications fit trucks with Hendrickson, Reyco, or Freightliner OEM suspension systems.

How difficult is it to replace drive axle springs and hangers, and what tools do I need?

Replacing drive axle springs and hangers typically requires 4-6 hours for an experienced mechanic. You'll need heavy-duty jack stands rated for commercial trucks, a floor jack, impact wrenches, and standard hand tools. The most challenging part is safely supporting the axle weight while removing the old components. Many customers report needing a torch for stubborn bolts due to rust. We strongly recommend having a second person assist for safety and using proper lifting equipment rated for your truck's weight.

What's the difference between OEM and aftermarket springs, and how does it affect ride quality?

OEM springs maintain factory ride specifications and typically last 300,000-500,000 miles under normal conditions. Our aftermarket options often use upgraded steel alloys that can extend service life by 20-30%. The main difference customers notice is that aftermarket heavy-duty springs may provide a slightly firmer ride when unloaded but better stability under load. Standard capacity aftermarket springs closely match OEM ride quality while offering better corrosion resistance through improved coatings.

How do I know when my drive axle springs and hangers need replacement?

Key indicators include visible cracks in spring leaves, broken or missing leaves, excessive rust or corrosion, uneven tire wear on drive axles, and a noticeable lean or sag when loaded. Worn hangers often show elongated bolt holes, cracks around mounting points, or excessive play when checked with a pry bar. If your truck sits more than 2 inches lower on one side or you hear clunking noises over bumps, immediate inspection is recommended.

Are heavy-duty springs worth the extra cost for my application?

Heavy-duty springs are recommended if you regularly haul at or near maximum capacity, operate on rough roads, or have experienced premature spring failure. They typically feature additional leaves and thicker steel construction. For highway driving with moderate loads, standard capacity springs provide adequate performance at a lower cost. Consider your typical payload - if you're consistently loading above 80% capacity, heavy-duty springs will reduce maintenance frequency and improve stability.