Freightliner SD 108-122 Drive Axle Springs-Hangers

Frequently Asked Questions About Freightliner SD 108-122 Drive Axle Springs-Hangers

What do drive axle springs and hangers actually do on my Freightliner SD 108-122?

Drive axle springs and hangers are part of the suspension system that supports the weight of the truck and cargo over the rear axles. The springs absorb road shock and help maintain ride height and axle alignment, while the hangers are the mounting brackets that attach the springs to the frame rail. Together they keep the axle positioned correctly and help distribute load evenly across the drivetrain.

How do I know if I need new springs, hangers, or both?

Common signs include sagging ride height, uneven tire wear, cracked or broken spring leaves, visible rust or metal fatigue on the hanger brackets, unusual clunking or shifting noises over bumps, or the truck pulling to one side. If a hanger is cracked, bent, or has worn bushing bores, it should be replaced along with any damaged springs since the two components work together to keep the axle secure.

Will these springs and hangers fit my specific Freightliner SD 108SD or 114SD model and configuration?

Fitment can vary based on axle capacity, spring type, and the specific chassis configuration of your truck, so it is important to check part numbers against your VIN or existing components before ordering. If you are unsure, comparing the dimensions and mounting pattern of your current hanger or spring, or contacting our parts team with your truck's specs, will help confirm you get the correct match.

What material and finish should I expect on replacement hangers?

Hangers in this category are typically made from cast or forged steel designed to handle the stress of heavy axle loads. Finishes vary by manufacturer, with many featuring a protective coating or paint to resist corrosion. Because these parts are exposed to road debris, moisture, and salt, checking for a durable finish is worth considering if you run in harsh conditions.

Can I install drive axle springs and hangers myself, or should I have a shop do it?

This is a heavy-duty suspension job that requires lifting and supporting the axle, removing torque rods or air ride components if equipped, and properly torquing hardware to spec. While experienced fleet mechanics with the right lift equipment can handle it, many owner-operators choose to have this done by a qualified truck repair shop to ensure proper alignment and torque, since improper installation can affect axle tracking and tire wear.