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    What Is DEF on a Semi Truck? Fluid, Filters, Problems & Maintenance(Post)

    What Is a DEF (Diesel Exhaust Fluid) Filter? A DEF (Diesel Exhaust Fluid) filter protects the SCR (Selective Catalytic Reduction) system by removing dirt, debris, and contaminants from the DEF supply

    Buyers Guide to Aftermarket Air Breather Panels(Post)

    Decorative light panels are an outstanding way to start personalizing your truck. Air breather panels offer tremendous visual appeal and can elevate your big rig's nighttime appearance. There are five

    Semi Truck DPF Box Covers & Slipcovers: Fitment Guide(Post)

    Semi Truck DPF Box Covers: Types, Fitment & Replacement What Is a DPF Box Cover on a Semi Truck? DPF box covers are exterior panels designed to conceal or protect the aftertreatment housing. They do n

    How A/C Driers Work on Your Semi Truck(Post)

    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 d

    T880 Visor Ultimate Buyer's Guide(Post)

    There are countless Kenworth T880 visor options to choose from depending on the theme and style you’re going for. Here's a quick buyer's guide for Kenworth T880 aftermarket visors. Before you buy, con

    How to Choose the Right W990 Drop Visor(Post)

    The best Kenworth W990 drop visor depends on your design preference, mounting configuration, and windshield type or cab style (curved or flat). Buying a Custom W990 Truck Visor Online?  If you're brow

    Semi Truck DPF Systems: How They Work, Problems, Regeneration & Parts(Post)

    Let’s break down how to maintain peak emissions performance and avoid excessive repairs on big truck exhausts. Key Takeaways DPFs trap soot, while DEF reduces harmful nitrogen oxide emissions. Watch

    What Does the FASS Fuel System Do? (Post)

    Diesel fuel often contains air, vapor, water, and fine debris - harmful contaminants that hurt fuel pressure stability, injector life, and injection pump health. FASS (fuel air separation system) help

    The 13 Best Christmas Gift Ideas for Truckers(Post)

    Some of the best gifts for truck drivers are accessories that help make their job easier. Truckers spend hours on end sitting in a single spot while dealing with the stresses of modern day driving. Th

    What Year Did Semi Trucks Get DPF Systems?(Post)

    When Did Semi Trucks Start Using DPF Systems? EPA Rules Explained Diesel particulate filters (DPFs) became standard equipment on new U.S. heavy-duty diesel trucks starting with the 2007 engine model y

    What are Semi Truck Winter Fronts?(Post)

    A semi-truck winter front is a heavy-duty, weather-resistant cover designed to mount directly over a truck’s front grille. Typically manufactured from reinforced vinyl, canvas, or quilted fabric, it s

    Preventative Maintenance Checklist for Semi Trucks(Post)

    In this post, we’ll cover the need for a semi truck preventative maintenance checklist, and some of the common replacement parts you can buy online and ship directly to your specified address. Key Ta

    Best Semi Truck Emergency Kit Accessories to Deter Roadside Breakdowns(Post)

    It’s cold, and late, and you’re suddenly stalled at the side of the road because your semi truck won’t start or won’t budge. If this sounds like a truck driver’s worst nightmare, it’s because it is. 

    Signs of a Failing Heater Box & What to Do About It(Post)

    Experiencing refreshing cool air in the summer and warm air in the winter is nearly priceless when behind the wheel of a big rig for 11 hours a day. However, if your A/C heater box isn’t working, your

    Wet Line Kits for Semi Trucks 101: The Basics Explained(Post)

    Ready to transform your rig into a hydraulic powerhouse? A semi-truck wet line kit can do the trick. One of these will turn your truck from a normal highway hauler into a workhorse capable of handlin

    How to Winterize a Semi Truck: The Complete Driver Checklist(Post)

    Cold winter weather, freezing temperatures, snow-covered roads, and adverse weather conditions wreak havoc on semi truck engines and equipment, and can lead to costly repairs if damage occurs. Don’t c

    Spare Semi Truck Parts Every Owner-Operator Should Keep(Post)

    For owner-operators, having the right spare parts on hand is the difference between experiencing devastating downtime and productive uptime. You don’t want to be caught on the side of the road waiting

    What are the Most Frequently Replaced Semi Truck Parts?(Post)

    The parts of a class 8 truck that see the most frequent repair and replacement are areas where tons of heat, friction, and pressure occur. No-brainer, right?  Here are some of the most frequently repl

    Semi Truck Boot Brush Guide: Does it Really Keep Your Cab Clean?(Post)

    Boot Brushes: The Key Takeaways Benefits: Keeps cab floors clean, improves footwear grip on steps and pedals, projects a professional appearance, prevents grit from grinding down interior flooring, a

    Diesel Truck Engine Maintenance Guide(Post)

    Semi truck engines can last up to one million miles, or more, before they need to be rebuilt or replaced.  During their lifespan, engine system parts experience a lot of heat and pressure, eventually

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  • FREE SHIPPING OVER $249
    BESTfit 5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-030 For Freightliner FLD

    BESTfit 5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-030 For Freightliner FLD

    BESTFIT TRUCK PARTS

    $135.99
    Multi-Bend 5 Inch Aluminized Turbo Pipe With Pyrometer Fitting Fits Freightliner FLDThis multi-bend turbo exhaust pipe for Freightliner trucks is made of aluminized steel. It features a 5.850-inch...
    03-08140300
    SKU:
    03-08140300
    Material Options:
    Steel
    Finish Options:
    Chrome-Plated
    Truck Class:
    Heavy Duty
    Product Type:
    Exhaust
    Make:
    Freightliner
    Ready To Ship:
    Yes
    $135.99
    Qty in Cart: 0
    Price:
    $135.99
    Subtotal:
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    Interior Fresh Air Filter For Peterbilt

    Interior Fresh Air Filter For Peterbilt

    CAB FRESH FILTER CO.

    $22.07
    Peterbilt Interior Fresh Air Filter AssemblyKeep the inside of your cab fresh with this aftermarket interior filter from CAB Fresh. This filter features internal antimicrobials that stops mold...
    01-1503026
    SKU:
    01-1503026
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $22.07
    Qty in Cart: 0
    Price:
    $22.07
    Subtotal:
  • FREE SHIPPING OVER $249
    Interior Fresh Air Filter Assembly For Peterbilt

    Interior Fresh Air Filter Assembly For Peterbilt

    CAB FRESH FILTER CO.

    $46.91
    Peterbilt Fresh Air Filter AssemblyFind aftermarket interior filters with assembly from CAB Fresh at 4 State Trucks. This filter features internal antimicrobials that stops mold growth, reduces odor...
    01-1503025
    SKU:
    01-1503025
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $46.91
    Qty in Cart: 0
    Price:
    $46.91
    Subtotal:
  • FREE SHIPPING OVER $249
    Air Filter Assembly For HVAC For Peterbilt & Kenworth

    Air Filter Assembly For HVAC For Peterbilt & Kenworth

    CAB FRESH FILTER CO.

    $38.75
    Air Filter Assembly Fits Peterbilt & KenworthAt 4 State Trucks we offer aftermarket CAB Fresh air filter assemblies for Peterbilt 567 and 579 models, and Kenworth T680 and T880 models. The air filter...
    29-1503002
    SKU:
    29-1503002
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Cloth
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Interior
    $38.75
    Qty in Cart: 0
    Price:
    $38.75
    Subtotal:
  • FREE SHIPPING OVER $249
    Air Filter Assembly For HVAC No Housing For Peterbilt & Kenworth

    Air Filter Assembly For HVAC No Housing For Peterbilt & Kenworth

    CAB FRESH FILTER CO.

    $14.27
    Air Filter Assembly Fits Peterbilt & KenworthWe offer aftermarket CAB Fresh air filter assemblies for Peterbilt 567 and 579 models, and Kenworth T680 and T880 models. The air filter is only for HVAC...
    29-1503003
    SKU:
    29-1503003
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $14.27
    Qty in Cart: 0
    Price:
    $14.27
    Subtotal:
  • FREE SHIPPING OVER $249
    Interior Cab Fresh Air Filter Replacement For Peterbilt 377, 378, 379 & 385

    Interior Cab Fresh Air Filter Replacement For Peterbilt 377, 378, 379 & 385

    CAB FRESH FILTER CO.

    $43.85
    Peterbilt Interior Cab Fresh Air FilterThis air filter fits under the dashboard on the passenger side. Simply slide the filter into the existing track next to the passenger door. It replaces the...
    01-1503017
    SKU:
    01-1503017
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $43.85
    Qty in Cart: 0
    Price:
    $43.85
    Subtotal:
  • FREE SHIPPING OVER $249
    Interior Cab Fresh Air Filter For Peterbilt 330, 335, 340, 357, 367, 377, 378, 379, 385 & 386

    Interior Cab Fresh Air Filter For Peterbilt 330, 335, 340, 357, 367, 377, 378, 379, 385 & 386

    CAB FRESH FILTER CO.

    $46.73
    Peterbilt Cab Fresh Air FilterThis air filter is easy to install under the dash. Just slide it into the existing OEM track located by the passenger door. Follow these simple steps, and you'll have it...
    01-1503018
    SKU:
    01-1503018
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $46.73
    Qty in Cart: 0
    Price:
    $46.73
    Subtotal:
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    Chrome AC Heater Filter Door For Peterbilt

    Chrome AC Heater Filter Door For Peterbilt

    UNITED PACIFIC

    Now: $21.74
    Was: $31.06
    Air Filter Door Fits Peterbilt* High Quality Filter Door* Made Of Chrome Plated Plastic* Sold Individually* Warranty On Filter Door Against Defects In Workmanship & Material From Date Of...
    01-1503015
    SKU:
    01-1503015
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Peterbilt
    Finish Options:
    Chrome-Plated
    Product Type:
    Interior
    Ready To Ship:
    Yes
    Now: $21.74
    Was: $31.06
    Qty in Cart: 0
    Price:
    Now: $21.74
    Was: $31.06
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  • High Flow Performance Air Filter With Washable Element Media For Volvo With EGR

    High Flow Performance Air Filter With Washable Element Media For Volvo With EGR

    FLEET FILTERS

    $444.99
    High Performance Air Filter Media Fits Volvo With EGRYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable, high flow, air...
    29-071300030
    SKU:
    29-071300030
    Truck Class:
    Heavy Duty
    Make:
    Volvo
    Product Type:
    Engine Parts
    $444.99
    Qty in Cart: 0
    Price:
    $444.99
    Subtotal:
  • 1-Piece Stainless Steel Diesel Particulate Filter Replaces 4965224NX, 4352989NX For Cummins ISM Engine

    1-Piece Stainless Steel Diesel Particulate Filter Replaces 4965224NX, 4352989NX For Cummins ISM Engine

    GLOBAL EMISSIONS

    $2,004.99
    1-Piece Stainless Steel Diesel Particulate Filter Fits Cummins ISM Engine* High Quality Diesel Particulate Filter* Made Of Stainless Steel * Exclusive 1-Piece Canister Design For Durability* OEM...
    29-080600030
    SKU:
    29-080600030
    Truck Class:
    Heavy Duty
    Style Options:
    Cummins
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $2,004.99
    Qty in Cart: 0
    Price:
    $2,004.99
    Subtotal:
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    HVAC Pre-Filter For Kenworth & Peterbilt

    HVAC Pre-Filter For Kenworth & Peterbilt

    FREEDOM AIR FILTERS

    $42.05
    Air Intake HVAC Fits Kenworth T680/T880 And Peterbilt 567/579* High Quality Polyester Mesh Pre-Filter* Mounting Clips Included - Grilles Not Included* Installs Under Hood On Passenger Side Beneath...
    29-1503007
    SKU:
    29-1503007
    Truck Class:
    Heavy Duty
    Color:
    Black
    Material Options:
    Plastic/Poly
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $42.05
    Qty in Cart: 0
    Price:
    $42.05
    Subtotal:
  • FREE SHIPPING OVER $249
    Cab Fresh Replacement Filter For Peterbilt

    Cab Fresh Replacement Filter For Peterbilt

    CAB FRESH FILTER CO.

    $17.91
    Interior Replacement Filter Fits PeterbiltFind aftermarket CAB Fresh replacement air filters for your Peterbilt at 4 State Trucks. It mounts under the dash in the interior of your cab and features...
    01-1503019
    SKU:
    01-1503019
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Cloth
    Make:
    Peterbilt
    Product Type:
    Interior
    Ready To Ship:
    Yes
    $17.91
    Qty in Cart: 0
    Price:
    $17.91
    Subtotal:
  • HVAC Intake Pre-Filter For Volvo VNL Gen II 2004-2018

    HVAC Intake Pre-Filter For Volvo VNL Gen II 2004-2018

    FREEDOM AIR FILTERS

    $36.85
    HVAC Intake Pre-Filter Fits Volvo VNL Gen II 2004-2018* High Quality Intake Pre-Filter* Proprietary Polyester Mesh* Passenger Side* Enhance The Efficiency Of Any Performance Or Exposed Air Filter*...
    13-150300004
    SKU:
    13-150300004
    Position:
    Passenger Side
    Color:
    Black
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Volvo
    Product Type:
    Interior
    $36.85
    Qty in Cart: 0
    Price:
    $36.85
    Subtotal:
  • Cab Fresh Pre- Filter W/ Black Housing For Kenworth T180-T480 & Peterbilt 589

    Cab Fresh Pre- Filter W/ Black Housing For Kenworth T180-T480 & Peterbilt 589

    CAB FRESH FILTER CO.

    $57.99
    Kenworth & Peterbilt Pre- Filter W/ Black HousingExtend the life of your Kenworth or Peterbilt cab air system with the Cab Fresh Pre-Filter, featuring a durable black housing. Designed to fit over...
    29-150300
    SKU:
    29-150300
    Product Type:
    Interior
    Style Options:
    Black Housing
    Make:
    Peterbilt
    Make:
    Kenworth
    $57.99
    Qty in Cart: 0
    Price:
    $57.99
    Subtotal:
  • Cab Fresh Pre- Filter W/ Black Housing For Freightliner Cascadia & Western Star 49X

    Cab Fresh Pre- Filter W/ Black Housing For Freightliner Cascadia & Western Star 49X

    CAB FRESH FILTER CO.

    $30.86
    Freightliner & Western Star Pre- Filter W/ Black HousingExtend the life of your cabin air filter with the Cab Fresh Pre-Filter for Freightliner Cascadia and Western Star 49X models. The black housing...
    03-150300
    SKU:
    03-150300
    Product Type:
    Interior
    Style Options:
    Black Housing
    Make:
    Western Star
    Make:
    Freightliner
    $30.86
    Qty in Cart: 0
    Price:
    $30.86
    Subtotal:
  • BESTfit Cabin Air Filter- 9 X 13.875 X 1 Inch Replaces 68012876AA For Freightliner Sprinter Van 2500 / 3500

    BESTfit Cabin Air Filter- 9 X 13.875 X 1 Inch Replaces 68012876AA For Freightliner Sprinter Van 2500 / 3500

    BESTFIT TRUCK PARTS

    $31.74
    9 X 13.875 X 1 Inch Cabin Air Filter By BESTfit Fits FreightlinerDon't let dust and debris compromise your driving comfort-choose the BESTfit 9 x 13.875 x 1 Inch Cabin Air Filter for Freightliner...
    03-150300005
    SKU:
    03-150300005
    Height Options:
    9 Inch
    Length Options:
    13 Inch
    Make:
    Freightliner
    Product Type:
    Interior
    Truck Class:
    Light Duty
    $31.74
    Qty in Cart: 0
    Price:
    $31.74
    Subtotal:
  • FASS Drop- In Series Fuel System Filter Pack W/ 3 Extreme Water Separator Filters & 3 Extended Life Particulate Filters

    FASS Drop- In Series Fuel System Filter Pack W/ 3 Extreme Water Separator Filters & 3 Extended Life Particulate Filters

    FASS

    $182.99
    Drop- In Series Fuel System Filter Pack W/ 3 Extreme Water Separator Filters & 3 Extended Life Particulate FiltersImprove fuel system protection and long-term performance with this FASS Drop-In...
    09-07030016
    SKU:
    09-07030016
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $182.99
    Qty in Cart: 0
    Price:
    $182.99
    Subtotal:
  • FASS Drop- In Series Fuel System Filter Pack W/ 2 Coalescing Water Separator Filters & 2 Extended Length Particulate Filters

    FASS Drop- In Series Fuel System Filter Pack W/ 2 Coalescing Water Separator Filters & 2 Extended Length Particulate Filters

    FASS

    $120.99
    Drop- In Series Fuel System Filter Pack W/ 2 Coalescing Water Separator Filters & 2 Extended Length Particulate FiltersEnhance fuel system reliability with this FASS Drop-In Series Filter Pack for...
    09-07030014
    SKU:
    09-07030014
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $120.99
    Qty in Cart: 0
    Price:
    $120.99
    Subtotal:
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