Peterbilt 387 Shock Absorbers

Frequently Asked Questions About Peterbilt 387 Shock Absorbers

Will these shock absorbers fit my Peterbilt 387 without modification?

Shock absorbers in this category are designed to match the front and rear suspension configurations used on the Peterbilt 387. However, fitment can vary depending on your truck's specific axle type, ride height, and suspension setup. Always check the listed specifications, part numbers, and OEM cross-reference information before ordering, and compare them against your truck's build sheet or the shocks currently installed to confirm a proper match.

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

Common signs of worn shocks include excessive bouncing or swaying, uneven tire wear, visible fluid leaks on the shock body, cracked or torn bushings, and a rougher, less controlled ride. If your truck feels less stable during braking or cornering, or you notice increased cab vibration, it is a good idea to inspect the shocks and replace them if they show signs of wear or damage.

Should I replace shock absorbers one at a time or in pairs?

It is generally recommended to replace shocks in pairs, either both front or both rear, at the same time. This helps maintain even damping and handling characteristics on both sides of the truck. Replacing only one worn shock can lead to inconsistent ride quality and uneven wear on tires and suspension components.

What is involved in installing new shock absorbers on a Peterbilt 387?

Installation typically involves securing the truck and supporting the axle, removing the upper and lower mounting bolts or pins from the old shock, and installing the new shock using the same hardware or new bushings if included. Torque specifications should be followed closely to ensure the shock is properly secured. While many owner-operators and shops handle this as a routine maintenance task, if you are unfamiliar with the process or your truck's specific mounting setup, having a qualified technician perform the installation is a good option.

Are there different shock absorber options for front and rear positions, and does that matter?

Yes, front and rear shock absorbers are typically designed differently to handle the distinct loads, geometry, and ride characteristics at each position. Front shocks often deal more with steering input and road feedback, while rear shocks manage load and cab stability. Make sure you select the correct front or rear specific shock for your application, as they are not usually interchangeable between positions.