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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 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

    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

    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

    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

    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

    7 Best Exterior Chrome Upgrades for the Kenworth W900A(Post)

    Outfit your Kenworth W900A model with stunning exterior chrome accessories and stainless-steel upgrades that seamlessly tie together the entire truck’s theme. Classic big rig owners take a lot of prid

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    BESTfit Intermediate Pipe Replaces 04-26247-014 For Freightliner Cascadia With Detroit Engine

    BESTfit Intermediate Pipe Replaces 04-26247-014 For Freightliner Cascadia With Detroit Engine

    BESTFIT TRUCK PARTS

    Now: $111.88
    Was: $498.99
    BESTfit Intermediate Pipe Fits FreightlinerRestore your Freightliner Cascadia's exhaust efficiency with the BESTfit Intermediate Pipe, crafted to replace OEM 04-26247-014 for Detroit engines...
    03-08170140
    SKU:
    03-08170140
    Truck Class:
    Heavy Duty
    Style Options:
    Detroit
    Material Options:
    Aluminized Steel
    Make:
    Freightliner
    Product Type:
    Exhaust
    Ready To Ship:
    Yes
    Now: $111.88
    Was: $498.99
    Qty in Cart: 0
    Price:
    Now: $111.88
    Was: $498.99
    Subtotal:
  • FREE SHIPPING OVER $249
    5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-014 For Freightliner FLD112, FLD120

    5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-014 For Freightliner FLD112, FLD120

    AFTERMARKET

    $127.99
    Multi-Bend 5 Inch Aluminized Turbo Pipe Without Pyrometer Fitting Fits Freightliner FLD* High Quality Multi-Bend Turbo Pipe* Made Of Aluminized Steel* Multi-Bend Turbo Pipe For Freightliner* 5 Inch...
    03-08140140
    SKU:
    03-08140140
    Product Type:
    Exhaust
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Finish Options:
    Chrome-Plated
    Make:
    Freightliner
    Ready To Ship:
    Yes
    $127.99
    Qty in Cart: 0
    Price:
    $127.99
    Subtotal:
  • BESTfit Bronze Bushing 11/16 OD X 9/16 ID X 1-3/4 Inch

    BESTfit Bronze Bushing 11/16 OD X 9/16 ID X 1-3/4 Inch

    BESTFIT TRUCK PARTS

    $8.09
    BESTfit 1.75 Inch Bronze Bushing Replaces 1407700, 01407700, 014-077-00* High Quality Bushing* Bronze* Dimensions: - 1.75 Inch Length - 0.688 Inch OD - 0.563 Inch ID* Sold Individually * Warranty On...
    09-05090014
    SKU:
    09-05090014
    Diameter Options:
    1/2 Inch
    Material Options:
    Bronze
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $8.09
    Qty in Cart: 0
    Price:
    $8.09
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300012 High Performance Air Filter For Ford, Freightliner & International

    3 Layer Replacement Air Filter Wrap For 29-071300012 High Performance Air Filter For Ford, Freightliner & International

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300012* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300014
    SKU:
    29-071300014
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • High Flow Performance Air Filter With Washable Element Media For Kenworth, Peterbilt & Western Star - Pair

    High Flow Performance Air Filter With Washable Element Media For Kenworth, Peterbilt & Western Star - Pair

    FLEET FILTERS

    $839.99
    High Performance Air Filter Media Fits Kenworth, Peterbilt, Western Star - PairYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only...
    29-090500014
    SKU:
    29-090500014
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Exterior
    $839.99
    Qty in Cart: 0
    Price:
    $839.99
    Subtotal:
  • 1-Piece Stainless Steel Diesel Particulate Filter Replaces 2880168, 2607031C1 For Cummins ISX Engines

    1-Piece Stainless Steel Diesel Particulate Filter Replaces 2880168, 2607031C1 For Cummins ISX Engines

    GLOBAL EMISSIONS

    $1,790.99
    1-Piece Stainless Steel Diesel Particulate Filter Fits Cummins ISX Engines* High Quality Diesel Particulate Filter* Made Of Stainless Steel * Exclusive 1-Piece Canister Design For Durability* OEM...
    29-080600014
    SKU:
    29-080600014
    Truck Class:
    Heavy Duty
    Style Options:
    Cummins
    Material Options:
    Stainless Steel
    Make:
    International
    Product Type:
    Exhaust
    $1,790.99
    Qty in Cart: 0
    Price:
    $1,790.99
    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:
  • On Sale
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    Limited Quantity Available
    1.5 X 5 Inch Crankcase Ventilation Filter Replacement - Replaces 5263190, CV50628

    1.5 X 5 Inch Crankcase Ventilation Filter Replacement - Replaces 5263190, CV50628

    DAYTON / DORMAN

    Now: $25.25
    Was: $126.99
    1.5 X 5 Inch Crankcase Ventilation Filter Replacement* High Quality Crankcase Ventilation Ideal Replacement* Filter Housing Included: Yes* Filter Media Material: Polypropylene* Finish: Black* Height:...
    29-071200014
    SKU:
    29-071200014
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    Now: $25.25
    Was: $126.99
    Qty in Cart: 0
    Price:
    Now: $25.25
    Was: $126.99
    Subtotal:
  • FASS Fuel Filter Housing Delete For Cummins 6.7L Engine 2019 & Newer

    FASS Fuel Filter Housing Delete For Cummins 6.7L Engine 2019 & Newer

    FASS

    $63.99
    Fuel Filter Housing DeleteBuilt for performance and clean installation, the FASS Fuel Filter Housing Delete for 2019-2022 Ram 6.7L Cummins engines removes the factory engine-mounted fuel filter...
    29-070300014
    SKU:
    29-070300014
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $63.99
    Qty in Cart: 0
    Price:
    $63.99
    Subtotal:
  • Steel 25 Gallon Side-Mount Hydraulic Reservoir W/ 10 Micron Filter

    Steel 25 Gallon Side-Mount Hydraulic Reservoir W/ 10 Micron Filter

    BUYERS PRODUCTS

    $483.99
    25 Gallon Hydraulic Reservoir With 10 Micron Filter* High Quality Carbon Steel Hydraulic Reservoir* Color Powder Coat Black* Dimensions  - 25 Gallon Capacity  - 16 Inch Length  - 22.25 Inch Width  -...
    09-02500014
    SKU:
    09-02500014
    Color:
    Black
    Truck Class:
    Universal
    Height Options:
    20 Inch
    Width Options:
    22 Inch
    Length Options:
    16 Inch
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Cargo Control
    Shape Options:
    Rectangular
    Finish Options:
    Black Powder Coat
    Capacity:
    25 Gallons
    Type Options:
    Side Mount
    $483.99
    Qty in Cart: 0
    Price:
    $483.99
    Subtotal:
  • Drag Link 31.25 Inch C To C - L24VU8460A11 For Kenworth T800

    Drag Link 31.25 Inch C To C - L24VU8460A11 For Kenworth T800

    AFTERMARKET

    $315.99
    31.25 Inch C To C Drag Link Replaces L24VU8460A11, L-24-VU-8460-A-11* High Quality Drag Link* 31.25 Inch C To C* 14.50 Inch E To E* Shaft Side Thread- 1-1/8 Inch-12 (Right Hand)* Gender- Male* Made...
    02-05090014
    SKU:
    02-05090014
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Length Options:
    31 1/4 Inch
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    $315.99
    Qty in Cart: 0
    Price:
    $315.99
    Subtotal:
  • 430 Stainless Steel Hi-Rise Pro Sleeper Rear Vertical Extension Trims For International 9900i/ix

    430 Stainless Steel Hi-Rise Pro Sleeper Rear Vertical Extension Trims For International 9900i/ix

    ROADWORKS

    $200.99
    430 Stainless Steel Hi-Rise Pro Sleeper Rear Vertical Extension Trims Fits International 9900i & 9900ix* High Quality Extension Trims* Made Of 430 Stainless Steel* Hi-Rise Pro Sleeper Lower Rear...
    07-101400002
    SKU:
    07-101400002
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    International
    Product Type:
    Exterior
    $200.99
    Qty in Cart: 0
    Price:
    $200.99
    Subtotal:
  • 304 Stainless Steel Hi-Rise Pro Sleeper Rear Vertical Extension Trims For International 9900i/ix

    304 Stainless Steel Hi-Rise Pro Sleeper Rear Vertical Extension Trims For International 9900i/ix

    ROADWORKS

    $251.99
    Stainless Steel Hi-Rise Pro Sleeper Rear Vertical Extension Trims Fit International 9900i/ix* High Quality Extension Trims* Made Of 304 Stainless Steel* Bolt Mount* Fits Truck With External Breathers...
    07-101400003
    SKU:
    07-101400003
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    International
    Product Type:
    Exterior
    $251.99
    Qty in Cart: 0
    Price:
    $251.99
    Subtotal:
  • Caterpillar C-15 9 Gallon Oil Pan, Replaces 1601428 By BESTfit

    Caterpillar C-15 9 Gallon Oil Pan, Replaces 1601428 By BESTfit

    BESTFIT TRUCK PARTS

    $906.99
    BESTfit Caterpillar C-15 Oil PanThis high quality aluminum aftermarket 9 gallon oil pan that fits Caterpillar C-15 replaces Caterpillar 160-1428 and has a warranty of 1 year.* High Quality Oil Pan*...
    09-071601428
    SKU:
    09-071601428
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    International
    Make:
    Western Star
    Make:
    Freightliner
    Make:
    Volvo
    Make:
    Kenworth
    Make:
    Peterbilt
    Capacity:
    9 Gallons
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $906.99
    Qty in Cart: 0
    Price:
    $906.99
    Subtotal:
  • 11 Tooth Air Compressor Extended Flange For Mack

    11 Tooth Air Compressor Extended Flange For Mack

    AUTOMANN USA

    $941.99
    Air Compressor Extended FlangeKeep your Mack truck's air system fully functional with this 11 Tooth Air Compressor with Extended Flange. Built to provide 145 PSI of reliable air pressure, it includes...
    11-070014
    SKU:
    11-070014
    Truck Class:
    Heavy Duty
    Make:
    Mack
    Product Type:
    Engine Parts
    $941.99
    Qty in Cart: 0
    Price:
    $941.99
    Subtotal:
  • Aluminized Steel Exhaust Elbow Replaces 04-17094-014 For Freightliner

    Aluminized Steel Exhaust Elbow Replaces 04-17094-014 For Freightliner

    UNITED PACIFIC

    $135.99
    Aluminized 5 Inch OD Exhaust ElbowUpdate your exhaust with this Freightliner turbo elbow. It has a 5 inch outer diameter and replaces part number 04-17094-014. Constructed to be rust resistant, it is...
    03-08070004
    SKU:
    03-08070004
    Material Options:
    Aluminized Steel
    Diameter Options:
    5 Inch
    Truck Class:
    Heavy Duty
    Style Options:
    Elbow Multi-Bend
    Make:
    Freightliner
    Product Type:
    Exhaust
    $135.99
    Qty in Cart: 0
    Price:
    $135.99
    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:
  • Door-Mounted Name Plate Replaces A22-68830-012, A22-68830-014 For Western Star 5700XE 2018-Current

    Door-Mounted Name Plate Replaces A22-68830-012, A22-68830-014 For Western Star 5700XE 2018-Current

    OPP - ORIGINAL PARTS PROGRAM

    $48.85
    Name Plate For Western Star 5700XE* High Quality Name Plate* Door Mounted * Sold Individually * Warranty On Name Plate Against Defects In Workmanship & Material From Date Of Purchase* Replaces OE...
    14-0914001OE
    SKU:
    14-0914001OE
    Truck Class:
    Heavy Duty
    Make:
    Western Star
    OEM:
    OEM
    Product Type:
    Exterior
    $48.85
    Qty in Cart: 0
    Price:
    $48.85
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit AC Condenser 31.5 X 24 Inch For Kenworth T2000

    BESTfit AC Condenser 31.5 X 24 Inch For Kenworth T2000

    BESTFIT TRUCK PARTS

    $106.99
    BESTfit AC Condenser Fits Kenworth* High Quality AC Condenser* Inches Core Size  - 31.500 Height  - 24.000 Width  - 0.625 Core Thickness* Sold Individually* Warranty On Condenser Against Defects In...
    02-070014
    SKU:
    02-070014
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $106.99
    Qty in Cart: 0
    Price:
    $106.99
    Subtotal:
  • BESTfit 18 Inch Texas Chrome Bumper W/ Boxed Ends & Tow Holes For Kenworth W900B & W900L

    BESTfit 18 Inch Texas Chrome Bumper W/ Boxed Ends & Tow Holes For Kenworth W900B & W900L

    BESTFIT TRUCK PARTS

    $786.99
    18 Inch Chrome Plated Steel Boxed End Texas Bumper W/ Tow Holes By BESTfitCombine classic Texas styling with heavy-duty performance with the BESTfit 18 Inch Chrome Bumper for Kenworth. Made from...
    02-010018014
    SKU:
    02-010018014
    Height Options:
    18 Inch
    Truck Class:
    Heavy Duty
    Style Options:
    Texas Boxed End
    Material Options:
    Steel
    Make:
    Kenworth
    Finish Options:
    Chrome-Plated
    Product Type:
    Bumpers
    Size Options:
    10 Gauge
    Type Options:
    Standard Mount
    Ready To Ship:
    Yes
    $786.99
    Qty in Cart: 0
    Price:
    $786.99
    Subtotal:
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