Frequently Asked Questions About Freightliner SD 108-122 Shock Absorbers

Will these shock absorbers fit my specific Freightliner model year?

The SD 108-122 shock absorbers are designed to fit Freightliner models from 1990-2007, including FLD 112/120/132, Classic, Classic XL, Columbia, Century, Coronado, and select Cascadia models. However, compatibility can vary based on suspension configuration and whether your truck has been modified. We recommend checking your current shock part numbers or calling us with your VIN to confirm exact fitment before ordering.

What's the difference between OEM and aftermarket options, and which should I choose?

OEM shocks typically last 100,000-150,000 miles and maintain factory ride quality, while quality aftermarket options like Gabriel or Monroe can offer similar performance at 30-40% less cost. Heavy-duty aftermarket shocks often feature upgraded seals and nitrogen charging for better heat dissipation. If you're running heavy loads consistently or want improved stability, consider heavy-duty aftermarket options. For maintaining stock ride quality, either OEM or standard aftermarket replacements work well.

Can I install these myself, or do I need special tools?

Installation typically takes 2-3 hours for all four shocks with basic hand tools. You'll need jack stands rated for commercial trucks, a floor jack, and standard sockets (usually 18mm-24mm). The biggest challenge is compressing the suspension to remove tension - many drivers use a bottle jack between the frame and axle. While doable for mechanically inclined owners, improper installation can be dangerous. If you're unsure, professional installation runs $200-400 and ensures proper torque specs are met.

How do I know when my shocks need replacement?

Look for these signs: oil leaking from the shock body, excessive bouncing after hitting bumps (more than 2-3 bounces), nose diving during braking, uneven tire wear, or a noticeably rougher ride. Physical inspection should reveal any bent shafts, damaged bushings, or missing hardware. Most drivers report needing replacement between 75,000-150,000 miles, depending on load weight and road conditions. Don't wait until complete failure - worn shocks increase stopping distance and reduce stability.

Should I replace all four shocks at once, or can I do them in pairs?

We strongly recommend replacing all four shocks simultaneously. Mixing old and new shocks creates uneven damping rates that can cause poor handling, premature wear on the new shocks, and irregular tire wear. If budget is a concern, replacing them in axle pairs (both fronts or both rears) is acceptable, but complete replacement within 6 months is ideal. The labor cost is nearly the same whether replacing two or four, making full replacement more economical.