The 4 State Trucks Blog

When it comes to upgrading your Peterbilt truck with chrome accessories, the aftermarket options are virtually endless.  If you're looking to add a bit more personalization to your rig than the traditional aftermarket upgrades of exhaust stacks, visors, and bumpers, consider tossing in a few chrome trim pieces and interior chrome accessories. Essential Exterior Chrome Accessories for Peterbilt Trucks You can essentially add chrome accent pieces to any part of the truck from the front and …

Ever wondered why your semi truck’s AC runs smoothly, or why it suddenly stops working? Your A/C receiver, drier, or accumulator is the unsung heroe of your commercial vehicle.  Maintaining your A/C drier is well worth the time. If continues to function well, this little part will serve as the filter and pressure valve to keep your truck’s AC system clean, well balanced, and safe.  Key Takeaways Driers and accumulators remove moisture, trap debris, and protect the AC comp …

Are you a commercial truck driver looking to customize your Peterbilt 389 truck with aftermarket accessories and parts, but don’t know where to start? This guide is here to help.  This model came out in 2006 and has been a hit with commercial drivers ever since - the latest iteration being the 2025 model year which launched 2 years prior.  Lauded as the “king of customizations” by Peterbilt inc., this model is designed to seamlessly incorporate an abundance of afterma …

When you’re driving a big rig, every part of your drivetrain matters—especially the clutch brake.  It may be a small, often overlooked component, but without it, your gear shifts from a standstill could get rough, loud, or downright damaging.  So, let’s break down what a semi truck clutch brake is, what it does, and how to keep it from wearing out too soon. What Is a Clutch Brake in a Semi Truck? A semi truck clutch brake is a circular disc made with a friction surfac …

You spend countless hours behind the wheel of your semi truck, looking at your fuel gauge, speedometer, and everything else on your dash. So, when it comes to aftermarket customizations, upgrading your interior should probably be the first thing on the list.  Key Takeaways Match the shifter knob to the transmission speed, brand, thread size, and shift-lever height. Verify whether the transmission needs range-only controls or both range and splitter controls. Confirm air-line port size, l …