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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

    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

    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

    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

    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

    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

    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

    Semi-Truck Mattress Sizes: Fitment Chart & Buying Guide(Post)

    Looking for the right sized semi truck mattress? Every long-haul trucker should prioritize spending a sizeable portion of their budget on a quality mattress and driver's seat. That's where you spend

    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

    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

    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

    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

    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

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  • FREE SHIPPING OVER $249
    BESTfit Turbo Pipe Replaces 04-17123-024 For Freightliner Century

    BESTfit Turbo Pipe Replaces 04-17123-024 For Freightliner Century

    BESTFIT TRUCK PARTS

    $210.99
    Turbo Pipe By BESTfit Fits FreightlinerRestore turbo efficiency on your Freightliner Century with the BESTfit Turbo Pipe, replacing OEM 04-17123-024. Built from aluminized steel, this high-quality...
    03-08130240
    SKU:
    03-08130240
    Truck Class:
    Heavy Duty
    Diameter Options:
    5 Inch
    Material Options:
    Steel
    Make:
    Freightliner
    Finish Options:
    Chrome-Plated
    Style Options:
    Elbow Multi-Bend
    Product Type:
    Exhaust
    $210.99
    Qty in Cart: 0
    Price:
    $210.99
    Subtotal:
  • RigMaster Upper Radiator Hose 10 1/2 Inch For T4-6 Models W/ Caterpillar Or Perkins Engine

    RigMaster Upper Radiator Hose 10 1/2 Inch For T4-6 Models W/ Caterpillar Or Perkins Engine

    RIGMASTER

    $16.03
    10 1/2 Inch Radiator Upper Hose - RP5-024Check out this quality 10.5 inch top radiator long hose at 4 State Trucks for T4-6 models with Caterpillar and Perkins engines! It's built to last and keep...
    RP5024
    SKU:
    RP5024
    Truck Class:
    Universal
    Length Options:
    10 1/2 Inch
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $16.03
    Qty in Cart: 0
    Price:
    $16.03
    Subtotal:
  • FREE SHIPPING OVER $249
    Chrome Air Filter Door For Peterbilt

    Chrome Air Filter Door For Peterbilt

    UNITED PACIFIC

    $32.20
    Air Filter Door Fits Peterbilt* High Quality Air Filter* Made Of Chrome Plated Plastic* Sold Individually* Warranty On Air Filter Against Defects In Workmanship & Material From Date Of...
    01-1504024
    SKU:
    01-1504024
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Peterbilt
    Finish Options:
    Chrome-Plated
    Product Type:
    Interior
    $32.20
    Qty in Cart: 0
    Price:
    $32.20
    Subtotal:
  • 1-Piece Stainless Steel Diesel Particulate Filter Replaces 4965227 For Cummins ISB/PX6 Engines

    1-Piece Stainless Steel Diesel Particulate Filter Replaces 4965227 For Cummins ISB/PX6 Engines

    GLOBAL EMISSIONS

    $1,410.99
    1-Piece Stainless Steel Diesel Particulate Filter Fits Cummins ISB & PX6 Engines* High Quality Diesel Particulate Filter* Made Of Stainless Steel * Exclusive 1-Piece Canister Design For Durability*...
    29-080600024
    SKU:
    29-080600024
    Truck Class:
    Heavy Duty
    Style Options:
    Cummins
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $1,410.99
    Qty in Cart: 0
    Price:
    $1,410.99
    Subtotal:
  • High Flow Performance Air Filter With Washable Element Media For Peterbilt & Kenworth

    High Flow Performance Air Filter With Washable Element Media For Peterbilt & Kenworth

    FLEET FILTERS

    $444.99
    High Performance Air Filter Media Fits Peterbilt, KenworthYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable, high...
    29-071300024
    SKU:
    29-071300024
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $444.99
    Qty in Cart: 0
    Price:
    $444.99
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  • High Flow Performance Air Filter With Washable Element Media For Kenworth T800, Peterbilt 388 - Pair

    High Flow Performance Air Filter With Washable Element Media For Kenworth T800, Peterbilt 388 - Pair

    FLEET FILTERS

    $839.99
    High Performance Air Filter Media Fits Kenworth T800, Peterbilt 388 - PairYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime,...
    29-090500024
    SKU:
    29-090500024
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Exterior
    $839.99
    Qty in Cart: 0
    Price:
    $839.99
    Subtotal:
  • FREE SHIPPING
    BESTfit 4 Inch Stainless Steel Tank Strap W/ Satin Finish For Peterbilt W/ 26 Inch Diameter Tanks Replaces 11-04551-001

    BESTfit 4 Inch Stainless Steel Tank Strap W/ Satin Finish For Peterbilt W/ 26 Inch Diameter Tanks Replaces 11-04551-001

    BESTFIT TRUCK PARTS

    $249.99
    4 Inch Satin Finish Stainless Steel Tank Strap By BESTfit Replaces 11-04551-001 Fits Peterbilt W/ 26 Inch Diameter TanksTank falling off your truck? Let 4 State Trucks help keep you and your truck...
    01-0601024
    SKU:
    01-0601024
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    Diameter Options:
    26 Inch
    $249.99
    Qty in Cart: 0
    Price:
    $249.99
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  • FASS Extended Length Particulate Filter W/ 144 Micron Rating

    FASS Extended Length Particulate Filter W/ 144 Micron Rating

    FASS

    $26.01
    Extended Length Particulate Filter W/ 144 Micron RatingEnhance fuel system protection with the FASS Extended Length Particulate Filter featuring a 144 micron filtration rating, designed for Titanium...
    09-07030024
    SKU:
    09-07030024
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $26.01
    Qty in Cart: 0
    Price:
    $26.01
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  • VC Stainless Steel DPF Filter Cover 3 Pieces W/ Permit Panel For Peterbilt 389/Glider

    VC Stainless Steel DPF Filter Cover 3 Pieces W/ Permit Panel For Peterbilt 389/Glider

    VALLEY CHROME PLATING

    $1,084.99
    3 Piece Stainless Steel DPF Filter Cover W/ Permit Panel By Valley Chrome Fits Peterbilt 389/GliderAdd a polished touch to your Peterbilt 389 with this 3 piece stainless steel replacement cover from...
    01-050246
    SKU:
    01-050246
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    $1,084.99
    Qty in Cart: 0
    Price:
    $1,084.99
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  • Gladhand Universal Cast W/ Filter 1/2 Inch FPT - 1241010

    Gladhand Universal Cast W/ Filter 1/2 Inch FPT - 1241010

    AUTOMANN USA

    $22.59
    1/2 Inch Universal Glad Hand Replaces 12-41010, 101F, F56321, 035031, And 81-0001-CThe Universal Glad Hand keeps your service lines running smoothly without pressure or power loss. Its durable cast...
    09-05500024
    SKU:
    09-05500024
    Truck Class:
    Universal
    Material Options:
    Cast Iron
    Make:
    Universal Items
    Product Type:
    Air, Electrical, & Safety
    $22.59
    Qty in Cart: 0
    Price:
    $22.59
    Subtotal:
  • 102 X 11 Inch Dunnage Racks for Step Deck and Flatbed Trailers

    102 X 11 Inch Dunnage Racks for Step Deck and Flatbed Trailers

    HEAVY DUTY RAMPS

    $1,285.99
    Dunnage Racks Holds Up to 16 Properly Tied-Down 8 4x4'sStore your dunnage easily under your trailer with this sturdy aluminum rack. It fits up to 16 tied-down 8' 4x4s, freeing up space for more cargo...
    19-024007
    SKU:
    19-024007
    Length Options:
    102 Inch
    Product Type:
    Trailer
    Height Options:
    11 Inch
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    $1,285.99
    Qty in Cart: 0
    Price:
    $1,285.99
    Subtotal:
  • BESTfit York Style 6 Inch Diameter 2 Groove AC Compressor Clutch Assembly - Replaces 024-25238

    BESTfit York Style 6 Inch Diameter 2 Groove AC Compressor Clutch Assembly - Replaces 024-25238

    BESTFIT TRUCK PARTS

    $160.99
    BESTfit 12V AC Clutch Assembly With 2 - 1/2 Inch Belts & Keyed Shaft* High Quality AC Clutch* 12 Volts* 2 Wats* 2 Groove* (2) 1/2 Inch Belt Type* 2 Wire Metripack Wire Type* Keyed Shaft* W/ Diode*...
    09-070000048
    SKU:
    09-070000048
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $160.99
    Qty in Cart: 0
    Price:
    $160.99
    Subtotal:
  • Threaded Bushing 0.875 OD X 1.75 Inch - 11/16 Inch-11 Thread For Chevrolet, GMC

    Threaded Bushing 0.875 OD X 1.75 Inch - 11/16 Inch-11 Thread For Chevrolet, GMC

    AUTOMANN USA

    $6.93
    Threaded Bushing Replaces 379647* High Quality Threaded Bushing* Dimensions:  - 1.75 Inch Length  - 0.875 Inch O.D.* Threads: 11/16 Inch-11* Sold Individually* Warranty On Threaded Bushings Against...
    12-05100024
    SKU:
    12-05100024
    Diameter Options:
    7/8 Inch
    Truck Class:
    Heavy Duty
    Length Options:
    1 3/4 Inch
    Material Options:
    Steel
    Make:
    GMC
    Make:
    Chevrolet
    Product Type:
    Frame & Chassis
    $6.93
    Qty in Cart: 0
    Price:
    $6.93
    Subtotal:
  • 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:
  • BESTfit York Style 6 Inch Diameter 2 Groove AC Compressor Clutch Assembly - Replaces 501939, 14192, 024-21590

    BESTfit York Style 6 Inch Diameter 2 Groove AC Compressor Clutch Assembly - Replaces 501939, 14192, 024-21590

    BESTFIT TRUCK PARTS

    $125.99
    BESTfit 12V AC Clutch Assembly With 2 - 1/2 Inch Belts & Keyed Shaft* High Quality AC Clutch* 12 Volts* 2 Groove* (2) 1/2 Inch Belt Type* 1 Wire Weatherpak Wire Type* Keyed Shaft* W/ Diode* Sold...
    09-070000047
    SKU:
    09-070000047
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $125.99
    Qty in Cart: 0
    Price:
    $125.99
    Subtotal:
  • BESTfit Camshaft For Cummins N14 Celect Plus - Replaces 3411327, 4024849

    BESTfit Camshaft For Cummins N14 Celect Plus - Replaces 3411327, 4024849

    BESTFIT TRUCK PARTS

    $733.99
    BESTfit Camshaft For Cummins N14 Celect Plus* High Quality Camshaft* For Cummins N14 Celect Plus* Sold Individually* Warranty On Camshafts Against Defects In Workmanship & Material From Date Of...
    29-074024849
    SKU:
    29-074024849
    Truck Class:
    Heavy Duty
    Product Type:
    Engine Parts
    $733.99
    Qty in Cart: 0
    Price:
    $733.99
    Subtotal:
  • FREE SHIPPING OVER $249
    TCS9000 Trailer Brake Valve With Handle - Replaces K024943

    TCS9000 Trailer Brake Valve With Handle - Replaces K024943

    OPP - ORIGINAL PARTS PROGRAM

    $195.99
    Trailer Brake Valve & Handle* High Quality Brake Valve* For Trailer Break* With Handle * Sold Individually * Warranty On Brake Valve Against Defects In Workmanship & Material From Date Of Purchase*...
    K024943
    SKU:
    K024943
    Truck Class:
    Heavy Duty
    Product Type:
    Air, Electrical, & Safety
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 2 Inch SS Cab-Sleeper Panels W/ 36 Underlit 3/4 Inch Amber/Clear LEDs For Freightliner Cascadia 116BBC

    2 Inch SS Cab-Sleeper Panels W/ 36 Underlit 3/4 Inch Amber/Clear LEDs For Freightliner Cascadia 116BBC

    PANELITE

    $1,467.99
    Stainless Cab-Sleeper Panels Fits Freightliner Cascadia 116BBC W/ 72 Inch Sleeper W/ No Extenders* High Quality Cab-Sleeper Panels* Made Of 304 Stainless Steel* Amber/Clear* Driver And Passenger* 2...
    03-091000024
    SKU:
    03-091000024
    Truck Class:
    Heavy Duty
    Light Options:
    With Lights
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Freightliner
    Finish Options:
    Paintable
    Length Options:
    72 Inch
    Product Type:
    Exterior
    $1,467.99
    Qty in Cart: 0
    Price:
    $1,467.99
    Subtotal:
  • AirDog Fuel Preporator W/ Installation Kit For Detroit Diesel 14L 60 Series Engines

    AirDog Fuel Preporator W/ Installation Kit For Detroit Diesel 14L 60 Series Engines

    AIRDOG HD

    $1,005.99
    Fuel Preporator W/ Installation Kit Fits Detroit Diesel 14L 60 Series EnginesKeep your Detroit Diesel 14L Series 60 engine operating at its best with the AirDog Fuel Preporator. Included are an...
    29-070300024
    SKU:
    29-070300024
    Product Type:
    Engine Parts
    $1,005.99
    Qty in Cart: 0
    Price:
    $1,005.99
    Subtotal:
  • Replacement Alumzd Steel Exhaust Y-Pipe Replaces A04-16885-024 For Freightliner Classic XL/120 & FLD120

    Replacement Alumzd Steel Exhaust Y-Pipe Replaces A04-16885-024 For Freightliner Classic XL/120 & FLD120

    AFTERMARKET

    $290.99
    Exhaust Y Pipe W/ 5 Inch OD Inlet & 5 Inch ID OutletsThis high quality 5 inch exhaust y-pipe that fits Freightliner Classic and FLD models will require an extension pipe to the BOM elbow if it used...
    03-0806001
    SKU:
    03-0806001
    Diameter Options:
    5 Inch
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Freightliner
    Finish Options:
    Chrome-Plated
    Style Options:
    T-Pipe
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    $290.99
    Qty in Cart: 0
    Price:
    $290.99
    Subtotal:
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