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

What Freightliner models and years are compatible with SD 108-122 drive axle springs and hangers?

The SD 108-122 drive axle springs and hangers are designed for Freightliner models including the FLD 112, FLD 120, Classic, Classic XL, Columbia, Century, and Coronado. These components typically fit model years from 1990 through 2010, though specific applications may vary. Always verify your truck's VIN and axle configuration before ordering, as some models may have different suspension setups depending on the build specifications.

How difficult is it to install these springs and hangers, and what tools are required?

Installing drive axle springs and hangers requires intermediate to advanced mechanical skills and typically takes 4-6 hours per side. Essential tools include a heavy-duty jack and jack stands rated for commercial vehicles, spring compressors, impact wrenches, torque wrenches, and proper safety equipment. Many customers recommend having a helper due to the weight of components. Professional installation is advised if you lack experience with heavy-duty suspension work, as improper installation can lead to safety issues and premature wear.

What is the weight capacity and material quality of these replacement springs?

Our SD 108-122 drive axle springs are manufactured from high-grade spring steel and meet or exceed OEM specifications. Standard capacity ranges from 20,000 to 23,000 pounds per axle, though specific ratings depend on the exact spring model selected. The hangers are constructed from heavy-duty steel with corrosion-resistant coating. All components undergo rigorous testing to ensure they maintain proper ride height and load distribution under commercial use conditions.

Should I replace springs and hangers together, or can they be replaced separately?

While springs and hangers can technically be replaced separately, we strongly recommend replacing them as a complete set. Worn hangers can cause premature spring failure, and new springs on worn hangers may not seat properly, leading to alignment issues and uneven tire wear. Replacing both components together ensures proper suspension geometry, maintains correct ride height, and typically costs less in labor than separate installations.

What are the signs that my drive axle springs or hangers need replacement?

Common indicators include visible cracks or breaks in spring leaves, sagging ride height on one or both sides, excessive squeaking or groaning sounds, worn or elongated hanger bolt holes, and uneven tire wear patterns. You may also notice increased cab shake, rough ride quality, or the truck leaning to one side when loaded. If you observe any spring leaves separated or shifted out of position, immediate replacement is necessary for safety.