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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

    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

    Top Semi Trucks Owned in Each State (Data for All 50 States) (Post)

    Here's some visual data on the most commonly owned heavy duty semi truck models based upon three popular truck brands: Peterbilt, Kenworth, and Freightliner. DISCLAIMER: (as of 2025) this data is four

    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

    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

    Seasonal Semi Truck Maintenance Checklist(Post)

    Freezing winter weather temperatures, heavy snow, ice, and road salt take an unseen toll on your semi truck. Corrosion directly affects your semi truck brakes, electrical terminals,  suspension mounts

    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

    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

    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

    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 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

    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

    Spring Semi-Truck Maintenance: 5 Checks to Prevent Expensive Repairs(Post)

    Winter weather causes corrosion, contamination, wear, and hidden damage. Spring is a great time to inspect the truck thoroughly and stop small problems from becoming giant disasters.  Five Spring Main

    How to Buy the Right Peterbilt 379 Radiator(Post)

    If you want to keep your diesel engine from overheating you need a well-functioning replacement Peterbilt radiator to properly carry the hot coolant through small passages, transfer engine heat into t

    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. 

    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

    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

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  • Intake Pre-Filter For LAF3551 Air Filter

    Intake Pre-Filter For LAF3551 Air Filter

    FREEDOM AIR FILTERS

    $76.99
    Intake Pre-Filter For P153551 Air Filter* High Quality Polyester Mesh Pre-Filter* This Is A Pre-Filter Wrap That Covers The Air Filter Element. Air Filter Element Not Included. Sold Separately.* Fits...
    09-0723000
    SKU:
    09-0723000
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Make:
    Western Star
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $76.99
    Qty in Cart: 0
    Price:
    $76.99
    Subtotal:
  • RigMaster APU Water Pump For Caterpillar, Perkins

    RigMaster APU Water Pump For Caterpillar, Perkins

    RIGMASTER

    $485.99
    OEM RigMaster Water Pump For Caterpillar & Perkins Engines* High Quality Water Pump* Sold Individually* Warranty On Water Pumps Against Defects In Workmanship & Material From Date Of Purchase*** High...
    145017380
    SKU:
    145017380
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $485.99
    Qty in Cart: 0
    Price:
    $485.99
    Subtotal:
  • Merritt Dyna-Light Aluminum Cab Rack 68 X 70 Inch W/ Tuck Away Tool Box

    Merritt Dyna-Light Aluminum Cab Rack 68 X 70 Inch W/ Tuck Away Tool Box

    MERRITT

    $1,890.99
    Aluminum Cab Rack W/ Radius Corners & Jail Bar Window 25 X 22 Inch* High Quality Cab Rack* Made Of Aluminum* 68 X 70 Inches* With Radius Corners-Kit* Jail Bar Window 25 Height X 22 Width* Tuck Away...
    317367K001
    SKU:
    317367K001
    Length Options:
    68 Inch
    Truck Class:
    Universal
    Width Options:
    70 Inch
    Product Type:
    Cargo Control
    Material Options:
    Aluminum
    Make:
    Universal Items
    $1,890.99
    Qty in Cart: 0
    Price:
    $1,890.99
    Subtotal:
  • Merritt Aluminum Cab Rack 68 X 70 Inch W/ 2 Chain Rack

    Merritt Aluminum Cab Rack 68 X 70 Inch W/ 2 Chain Rack

    MERRITT

    $2,922.99
    Aluminum Cab Rack W/ Jail Bar Window, Radius Corners & Full Tray W/ Lid* High Quality Cab Rack* Made Of Aluminum * 68 Inch Height X 70 Inch Width * 2 Chain Rack * Full Tray With Lid * Jail Bar...
    317367C0059
    SKU:
    317367C0059
    Material Options:
    Aluminum
    Product Type:
    Cargo Control
    Finish Options:
    Diamond Plate
    Height Options:
    68 Inch
    Truck Class:
    Heavy Duty
    Width Options:
    70 Inch
    Make:
    Universal Items
    $2,922.99
    Qty in Cart: 0
    Price:
    $2,922.99
    Subtotal:
  • Merritt Dyna-Light Aluminum Cab Rack 68 X 70 Inch W/ Tuck Away Tool Box 24 X 24 X 20 Inch

    Merritt Dyna-Light Aluminum Cab Rack 68 X 70 Inch W/ Tuck Away Tool Box 24 X 24 X 20 Inch

    MERRITT

    $2,471.99
    Aluminum Cab Rack W/ Radius Corners, Jail Bar Window, 2 Chain Racks & 2 Chain Trays* High Quality Cab Rack* Made Of Aluminum* 68 X 70 Inches* With Radius Corners* Jail Bar Window 25 Height X 22...
    317367K002
    SKU:
    317367K002
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Product Type:
    Cargo Control
    Length Options:
    68 Inch
    Width Options:
    70 Inch
    Make:
    Universal Items
    $2,471.99
    Qty in Cart: 0
    Price:
    $2,471.99
    Subtotal:
  • Merritt Aluminum Cab Rack 68 X 70 Inch W/ 1 Full Chain Tray & Full Lid

    Merritt Aluminum Cab Rack 68 X 70 Inch W/ 1 Full Chain Tray & Full Lid

    MERRITT

    $2,349.99
    Aluminum Cab Rack W/ Jail Bar Window & Radius Corners* High Quality Cab Rack* Made Of Aluminum* 68 Inch Height * 70 Inch Width* With Radius Corners* Jail Bar Window  - 25 Inch Height   - 22 Inch...
    317367C0055
    SKU:
    317367C0055
    Finish Options:
    Diamond Plate
    Height Options:
    68 Inch
    Material Options:
    Aluminum
    Truck Class:
    Universal
    Width Options:
    70 Inch
    Product Type:
    Cargo Control
    Make:
    Universal Items
    $2,349.99
    Qty in Cart: 0
    Price:
    $2,349.99
    Subtotal:
  • Merritt 68 X 70 Inch Dyna-Light Aluminum Cab Rack

    Merritt 68 X 70 Inch Dyna-Light Aluminum Cab Rack

    MERRITT

    $2,705.99
    Aluminum Cab Rack W/ Center Enclosure & Radius Corners* High Quality Cab Rack* Made Of Aluminum * 68 Inch Height * 70 Inch Width* Center Enclosure* Merritt Dyna-Light * Radius Corners* Sold...
    317373
    SKU:
    317373
    Height Options:
    68 Inch
    Finish Options:
    Diamond Plate
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Product Type:
    Cargo Control
    Style Options:
    1 Door
    Width Options:
    70 Inch
    Make:
    Universal Items
    $2,705.99
    Qty in Cart: 0
    Price:
    $2,705.99
    Subtotal:
  • FREE SHIPPING OVER $249
    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
    Pre-Filter For Air Cleaner For Kenworth & Peterbilt

    Pre-Filter For Air Cleaner For Kenworth & Peterbilt

    CAB FRESH FILTER CO.

    $33.71
    Pre-Filter For Air Cleaner Fits Kenworth & PeterbiltWe offer aftermarket CAB Fresh pre-filters for air cleaners that fits Kenworth T680, T880, Peterbilt 567 and 579 big rigs. It features activated...
    29-0905708
    SKU:
    29-0905708
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Cloth
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Exterior
    Ready To Ship:
    Yes
    $33.71
    Qty in Cart: 0
    Price:
    $33.71
    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
    Cab Fresh Filter Only For Freightliner Cascadia, Century, Columbia & Coronado

    Cab Fresh Filter Only For Freightliner Cascadia, Century, Columbia & Coronado

    CAB FRESH FILTER CO.

    $17.91
    Cab Fresh Filter Only Fits FreightlinerFind your Cab Fresh Replacement Filter at 4 State Trucks. The highly effective filter is made with a primary layer and charcoal layer that traps and eliminates...
    03-091306
    SKU:
    03-091306
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Cloth
    Make:
    Freightliner
    Product Type:
    Exterior
    $17.91
    Qty in Cart: 0
    Price:
    $17.91
    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
    Ready To Ship:
    Yes
    $38.75
    Qty in Cart: 0
    Price:
    $38.75
    Subtotal:
  • FREE SHIPPING
    4 X 6 Inch Model 8800 Evolution 2 LED Headlights

    4 X 6 Inch Model 8800 Evolution 2 LED Headlights

    AFTERMARKET

    $437.99
    Heated Headlight W/ Chrome Bezel, Clear Outer Lens Color* High Quality Headlights* 4 X 6* 12-24V DOT/ECE LED High Beam* Heated With Chrome Bezel* Outer Lens Material- Hardcoated Polycarbonate* Outer...
    29-1606173
    SKU:
    29-1606173
    Lumens:
    2001 to 4999 Lumens
    Color:
    Black
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Lighting
    $437.99
    Qty in Cart: 0
    Price:
    $437.99
    Subtotal:
  • Stainless Steel Diesel Particulate Filter Replaces 2517331C91 For International W/ MaxxForce 7/DT Engine

    Stainless Steel Diesel Particulate Filter Replaces 2517331C91 For International W/ MaxxForce 7/DT Engine

    GLOBAL EMISSIONS

    $1,634.99
    Stainless Steel Diesel Particulate Filter Fits International W/ MaxxForce 7/DT Engines - Replaces 2517331C91* High Quality Diesel Particulate Filter* Made Of Stainless Steel * OEM Quality Clamps And...
    07-080600002
    SKU:
    07-080600002
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    International
    Product Type:
    Exhaust
    $1,634.99
    Qty in Cart: 0
    Price:
    $1,634.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Black Plastic Cab Fresh Filter For Freightliner Cascadia, Century, Columbia & Coronado

    Black Plastic Cab Fresh Filter For Freightliner Cascadia, Century, Columbia & Coronado

    CAB FRESH FILTER CO.

    $51.99
    Cab Fresh Filter Fits FreightlinerReplace your original filter with this cab fresh filter with a charcoal spor-ax antimicrobial layer. This charcoal layer has adsorption properties that help capture...
    03-091305
    SKU:
    03-091305
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Freightliner
    Color:
    Black
    Product Type:
    Exterior
    $51.99
    Qty in Cart: 0
    Price:
    $51.99
    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
    Cab Fresh Replacement HVAC Pre-Filter For Peterbilt & Kenworth

    Cab Fresh Replacement HVAC Pre-Filter For Peterbilt & Kenworth

    CAB FRESH FILTER CO.

    $14.27
    Air Filter HVAC Pre-FilterKeep your HVAC system running clean and efficient with this replacement pre-filter designed to fit inside the existing housing assembly. It helps capture dust, debris, and...
    29-091301
    SKU:
    29-091301
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Ready To Ship:
    Yes
    Product Type:
    Interior
    $14.27
    Qty in Cart: 0
    Price:
    $14.27
    Subtotal:
  • Brake Drum Outboard 16.5 x 7 Inch Light Weight 9006X, 53-123537-002, 89996B

    Brake Drum Outboard 16.5 x 7 Inch Light Weight 9006X, 53-123537-002, 89996B

    AUTOMANN USA

    $282.99
    80000 Series Brake Drum* High quality drum* Steel Shell With Fused GrAY iRON lINER* Brake size: 16.5 x 7 inches* Bolt number: 10* Bolt circle diameter: 11.25 inches* Pilot diameter: 8.78 inches*...
    09-0517303
    SKU:
    09-0517303
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Steel
    Product Type:
    Frame & Chassis
    $282.99
    Qty in Cart: 0
    Price:
    $282.99
    Subtotal:
  • Textured Black Steel Running Boards For Ford F250 & F350 Regular Cab 2017-Current

    Textured Black Steel Running Boards For Ford F250 & F350 Regular Cab 2017-Current

    GO RHINO

    $602.99
    Go Rhino 634417348PC RB10 Running Boards Plus Brackets Complete Kit* High Quality Running Boards* Cab Length Running Boards For Popular Crew Cab And Extended Cab Trucks* Includes Mounting Brackets...
    634417348PC
    SKU:
    634417348PC
    Truck Class:
    Light Duty
    Color:
    Black
    Material Options:
    Steel
    Make:
    Ford
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $602.99
    Qty in Cart: 0
    Price:
    $602.99
    Subtotal:
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