4 State Trucks carries the best new semi truck parts for Peterbilt, Kenworth, Freightliner, International, and more.

No matter your truck make or model, you’ll find trusted aftermarket options here. Keep your air brake system tight and your trailer air lines flowing freely with reliable parts that won’t let you down.

Your semi truck’s exhaust system does more than just move fumes out of the engine—it plays a huge role in performance, emissions control, and style. That’s why we carry a massive selection of heavy …

Find reliable aftermarket upgrades and replacement components that are make-model specific, whether you need Kenwoth W900 truck parts or T680 replacement parts, we have your make/model-specific …

Ready to shop for our newest semi truck product inventory to date? Check out our new semi truck products and tools!

Feb 24, 2025 · Read this ultimate guide to aftermarket semi-truck seats to find the best seating options you can.

Will a CSM bumper fit my specific truck model and year? CSM bumpers are designed for specific truck models and years. Most commonly, they fit Peterbilt 379 (1987-2007), Peterbilt 389 (2008-present), …

Shop our clearance sale at 4 State Trucks for unparalleled savings on essential semi-truck parts! It's the perfect opportunity for truck owners to upgrade or maintain their fleet while saving.

From fleet workhorses to fully customized show trucks, we’ve got the truck lighting you need to elevate your Volvo. 4 State Trucks is the trusted source for quality lighting parts that blend safety, durability, …

Most of our semi truck cab lights are made for universal fitment. That means they work with just about any Class 8 truck—Freightliner, Kenworth, Peterbilt, Western Star, and more.