Peterbilt 357/378 Shock Absorbers

Frequently Asked Questions About Peterbilt 357/378 Shock Absorbers

Will these shock absorbers fit my Peterbilt 357 or 378 without modification?

Shock absorbers for these models are designed to match the factory mounting points and specifications for the 357 and 378 chassis. However, ride height, axle configuration, and suspension setup can vary between trucks, so it's important to verify your truck's exact specs against the product listing or reach out to our team before ordering to confirm proper fit.

How do I know if my current shock absorbers need to be replaced?

Common signs of worn shocks include excessive bouncing, a rougher than normal ride, uneven tire wear, visible fluid leaking from the shock body, or the cab swaying more than usual over bumps and turns. If you're noticing any of these symptoms, it's a good idea to inspect the shocks and consider replacement.

What is the difference between steer axle, drive axle, and cab shock absorbers?

Shock absorbers are typically engineered for a specific location on the truck since each position handles different weight loads and movement. Steer axle shocks manage front-end stability, drive axle shocks support rear suspension under heavier loads, and cab shocks control cab movement independent of the chassis. Make sure you're selecting the correct type for the position you're replacing.

Can I install these shock absorbers myself, or do I need a professional?

Many owner-operators and shop technicians replace shock absorbers themselves, as the job generally involves basic hand tools and a lift or jack stands to access the mounting bolts. That said, if you're not comfortable working under the truck or your setup has additional components like air ride linkages, having a qualified technician handle the installation is a safe option.

Should I replace shock absorbers in pairs?

Yes, it's generally recommended to replace shocks in pairs, either both on the front axle or both on the rear, even if only one appears worn. This helps maintain even handling and ride quality on both sides of the truck rather than pairing a new shock with one that has already lost some of its dampening ability.