When upgrading semi-truck air cleaners, explore OEM replacements for perfect fits, aftermarket options for variety, or high-performance setups for better engine performance.

At 4 State Trucks, you can upgrade the style of your rig with semi truck rear fenders. We offer a range of options from top brands like Hogebuilt, Merritt, and Minimizer, as well as budget-friendly choices …

If you’re a fleet maintenance manager or a heavy-duty diesel mechanic, our extensive lineup of semi truck tools has just what you need. We also stock a wide array of universal tools and accessories for …

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

Shop Heavy Duty Replacement Mirrors at 4 State Trucks Browse our full range of aftermarket commercial truck mirrors—from quick replacement heads to complete arm assemblies. Each one is …

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

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, …

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 …

Check out the best semi truck air horns over at 4 State Trucks. Whether you're into powerful train horns or sleek dual-tone options, we've got you covered for loud, reliable performance.

Discover the perfect semi-truck seat at 4 State Trucks for ultimate comfort and support. Explore adjustable features, durable materials, and vibration dampening for a smooth ride.