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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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    5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-012 For Freightliner FLD

    5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-012 For Freightliner FLD

    AFTERMARKET

    $124.99
    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...
    03-08140120
    SKU:
    03-08140120
    Material Options:
    Steel
    Finish Options:
    Chrome-Plated
    Truck Class:
    Heavy Duty
    Product Type:
    Exhaust
    Make:
    Freightliner
    $124.99
    Qty in Cart: 0
    Price:
    $124.99
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  • High Flow Performance Air Filter With Washable Element Media For Freightliner, International & Ford

    High Flow Performance Air Filter With Washable Element Media For Freightliner, International & Ford

    FLEET FILTERS

    $443.99
    High Flow Performance Air Filter With Washable Element Media Fits Freightliner, InternationalYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the...
    29-071300012
    SKU:
    29-071300012
    Truck Class:
    Heavy Duty
    Make:
    Sterling
    Product Type:
    Engine Parts
    $443.99
    Qty in Cart: 0
    Price:
    $443.99
    Subtotal:
  • Aluminized Steel Exhaust Elbow Replaces 04-17094-012 For Freightliner

    Aluminized Steel Exhaust Elbow Replaces 04-17094-012 For Freightliner

    UNITED PACIFIC

    $131.99
    Aluminized Exhaust ElbowThis aluminized steel exhaust elbow for excellent rust resistance replaces. Made for specific Freightliner models, it replaces part number 17094-012. Shop 4 State Trucks for...
    03-08070003
    SKU:
    03-08070003
    Material Options:
    Aluminized Steel
    Truck Class:
    Heavy Duty
    Style Options:
    Elbow Multi-Bend
    Make:
    Freightliner
    Product Type:
    Exhaust
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
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  • Fan Override Switch Replaces 79PSL3-4, P27-1051, 11-1409, 1310 For Peterbilt, Kenworth

    Fan Override Switch Replaces 79PSL3-4, P27-1051, 11-1409, 1310 For Peterbilt, Kenworth

    AFTERMARKET

    $52.99
    Replacement Paccar Fan Override SwitchThis high-quality fan override switch is designed to provide reliable temperature-based control in heavy-duty cooling systems. It features an M10-1.25 threaded...
    29-07100012
    SKU:
    29-07100012
    Product Type:
    Engine Parts
    Color:
    Orange
    Make:
    Kenworth
    Make:
    Peterbilt
    $52.99
    Qty in Cart: 0
    Price:
    $52.99
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  • FASS Spin- On Water Separator Fuel Filter For FASS Drop- In Series Fuel System

    FASS Spin- On Water Separator Fuel Filter For FASS Drop- In Series Fuel System

    FASS

    $35.19
    Spin- On Water Separator Fuel Filter Use With FASS Drop- In Series Fuel SystemsEnsure cleaner fuel and better engine protection with the FASS Spin-On Water Separator Fuel Filter designed for FASS...
    09-07030012
    SKU:
    09-07030012
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $35.19
    Qty in Cart: 0
    Price:
    $35.19
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  • FASS Fuel Filter Housing Delete For Cummins 6.7L Engine 2010-2018

    FASS Fuel Filter Housing Delete For Cummins 6.7L Engine 2010-2018

    FASS

    $63.99
    Fuel Filter Housing DeleteStreamline your diesel fuel system with the FASS Fuel Filter Housing Delete for 2010-2018 Ram 6.7L Cummins engines. This high-quality delete kit is engineered to remove the...
    29-070300012
    SKU:
    29-070300012
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $63.99
    Qty in Cart: 0
    Price:
    $63.99
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  • Stainless Steel Passenger Side Exhaust Filter For Peterbilt 300 Series

    Stainless Steel Passenger Side Exhaust Filter For Peterbilt 300 Series

    PHOENIX DESIGN

    $341.99
    Passenger Side Exhaust Filter* High Quality Exhaust Filter* Cab/Cowl 1 Piece (Bodyline)* Stainless Steel* Passenger Side* Sold Individually* Warranty On Exhaust Filters Against Defects In Workmanship...
    01-0912012331
    SKU:
    01-0912012331
    Product Type:
    Exhaust
    Position:
    Passenger Side
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    $341.99
    Qty in Cart: 0
    Price:
    $341.99
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    BLEMISHED: Stainless Steel DPF Filter Cover For Peterbilt 389

    BLEMISHED: Stainless Steel DPF Filter Cover For Peterbilt 389

    4 STATE TRUCKS

    $879.99
    Peterbilt 389 SS DPF Filter CoverNormally $1,573.99 Plus Shipping, Buy This One Now For $1,145.00 with Free Shipping! You Save $425+ Plus Shipping Cost!***MINOR SURFACE SCRATCHES-BLEMISHED...
    ZB10001249
    SKU:
    ZB10001249
    Product Type:
    Exhaust
    $879.99
    Qty in Cart: 0
    Price:
    $879.99
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    BESTfit Cabin Air Filter 14 X 6 Inch For Mack CV, CX & CH Replaces 82745222

    BESTfit Cabin Air Filter 14 X 6 Inch For Mack CV, CX & CH Replaces 82745222

    BESTFIT TRUCK PARTS

    $23.99
    14 X 6 Inch Cabin Air Filter By BESTfit Fits Mack CV, CX & CH Replaces 82745222Improve cab air quality and HVAC performance with the BESTfit Cabin Air Filter for Mack CV, CX, and CH trucks, designed...
    11-150300012
    SKU:
    11-150300012
    Product Type:
    Interior
    Width Options:
    1 Inch
    Length Options:
    14 Inch
    Height Options:
    6 Inch
    Make:
    Mack
    $23.99
    Qty in Cart: 0
    Price:
    $23.99
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  • BESTfit 6.25 X 12.375 X 1.25 Inch Paper Cabin Air Filter Replaces 3839141-C1 For International

    BESTfit 6.25 X 12.375 X 1.25 Inch Paper Cabin Air Filter Replaces 3839141-C1 For International

    BESTFIT TRUCK PARTS

    $14.99
    BESTfit Paper Cabin Air Filter Fits International* High Quality Cabin Air Filter* Length: 12-3/8 Inch * Height: 6-1/4 Inch * Thickness: 1-1/4 Inch * Sold Individually* Warranty On Cabin Air Filter...
    07-150300012
    SKU:
    07-150300012
    Truck Class:
    Heavy Duty
    Length Options:
    12 Inch
    Make:
    International
    Product Type:
    Interior
    $14.99
    Qty in Cart: 0
    Price:
    $14.99
    Subtotal:
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    Carrier Bearing Kit With Bracket Replaces 210121-1X CB2101211XSA

    Carrier Bearing Kit With Bracket Replaces 210121-1X CB2101211XSA

    OPP - ORIGINAL PARTS PROGRAM

    $108.99
    Carrier Bearing Kit* High Quality Carrier Bearing Kit* 17N Series With Bracket* Sold As Kit* Warranty On Hub Adapter Against Defects In Workmanship & Material From Date Of Purchase*|** This Is An OEM...
    CB2101211XSA
    SKU:
    CB2101211XSA
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $108.99
    Qty in Cart: 0
    Price:
    $108.99
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    Dock Bumper Rubber 3 X 6 X 3 Inch Dock Bumper

    Dock Bumper Rubber 3 X 6 X 3 Inch Dock Bumper

    AUTOMANN USA

    $12.71
    Dock Bumper- 3 X 6 X 3 Inch Replaces B5500, 31497, 43445Safeguard your loading areas with the Rubber 3 X 6 X 3 Inch Dock Bumper, designed to absorb impact and prevent costly damage. Constructed from...
    09-012500
    SKU:
    09-012500
    Truck Class:
    Universal
    Make:
    Universal Items
    Ready To Ship:
    Yes
    Height Options:
    3 Inch
    Product Type:
    Bumpers
    Length Options:
    3 1/2 Inch
    Width Options:
    6 Inch
    Material Options:
    Rubber
    $12.71
    Qty in Cart: 0
    Price:
    $12.71
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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:
  • 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:
  • BESTfit 6.625 X 12.0625 X 2.625 Inch AC Evaporator Replaces 3670125-C91, 3670132-C1 For International

    BESTfit 6.625 X 12.0625 X 2.625 Inch AC Evaporator Replaces 3670125-C91, 3670132-C1 For International

    BESTFIT TRUCK PARTS

    $240.99
    BESTfit AC Evaporator With Expansion Block Fits International 4000, 7000, 8000, LoneStar & ProStar* High Quality AC Evaporator* Height: 6 5/8 Inch* Length: 12 1/16 Inch* Inlet: #8 Bead Into Txv*...
    07-070000012
    SKU:
    07-070000012
    Truck Class:
    Heavy Duty
    Make:
    International
    Product Type:
    Engine Parts
    $240.99
    Qty in Cart: 0
    Price:
    $240.99
    Subtotal:
  • BESTfit Fuel Sender Replaces A22-68359-012 For Freightliner M2 With 18 Inch Rectangular Tank

    BESTfit Fuel Sender Replaces A22-68359-012 For Freightliner M2 With 18 Inch Rectangular Tank

    BESTFIT TRUCK PARTS

    $81.99
    Fuel Sender By BESTfit Fits Freightliner M2 With 18 Inch Rectangular Tank* High Quality Fuel Level Sender* For Trucks With 18 Inch Tall Rectangular Fuel Tanks* Restore Proper Fuel Gauge Readings With...
    03-060317
    SKU:
    03-060317
    Truck Class:
    Heavy Duty
    Shape Options:
    Rectangular
    Make:
    Freightliner
    Product Type:
    Fuel Tanks
    $81.99
    Qty in Cart: 0
    Price:
    $81.99
    Subtotal:
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    CSM 11 Inch Light Bracket W/ Bulkhead Style Light Holes For 70 Inch Sleeper Extension Panels

    CSM 11 Inch Light Bracket W/ Bulkhead Style Light Holes For 70 Inch Sleeper Extension Panels

    CHROME SHOP MAFIA

    $27.25
    11 Inch Light Bracket Mounts To Bottom Of 70 Inch Sleeper Panel Flange By Chrome Shop MafiaThis 11-inch light bracket with bulkhead style light holes mounts on the bottom flange of 70-inch sleeper...
    09-160200012
    SKU:
    09-160200012
    Truck Class:
    Heavy Duty
    Finish Options:
    Polished
    Material Options:
    Stainless Steel
    Length Options:
    11 Inch
    Make:
    Universal Items
    Product Type:
    Exterior
    Ready To Ship:
    Yes
    $27.25
    Qty in Cart: 0
    Price:
    $27.25
    Subtotal:
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    Air Dog Champ II Air Fuel Separator For CAT Engines 3406E, C13, C15, C16, C18

    Air Dog Champ II Air Fuel Separator For CAT Engines 3406E, C13, C15, C16, C18

    AIRDOG HD

    $508.99
    Air Dog Champ II Air Fuel Separator Fits CAT EnginesGet your AirDog Champ II spin-on high-pressure fuel air separator at 4 State Trucks! It is designed specifically for CAT engines with secondary...
    09-07030120
    SKU:
    09-07030120
    Truck Class:
    Universal
    Location:
    Made In USA
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $508.99
    Qty in Cart: 0
    Price:
    $508.99
    Subtotal:
  • S.S. Front Air Cleaner Light Panels W/ 12 - 2 Inch Light Holes For Freightliner Classic W/ 11 Inch Nelson

    S.S. Front Air Cleaner Light Panels W/ 12 - 2 Inch Light Holes For Freightliner Classic W/ 11 Inch Nelson

    PHOENIX DESIGN

    $191.99
    Front Breather Light Panels W/ 12 - 2 Inch Light Holes Fit Freightliner Classic W/ 11 Inch Nelson Breather* High Quality Front Air Cleaner Panel* Made Of 304 Stainless Steel * 11 Inch* 6 - 2 Inch...
    03-090500012
    SKU:
    03-090500012
    Truck Class:
    Heavy Duty
    Light Options:
    Without Lights
    Material Options:
    Stainless Steel
    Make:
    Freightliner
    Finish Options:
    Polished
    Height Options:
    11 Inch
    Position:
    Front
    Product Type:
    Exterior
    $191.99
    Qty in Cart: 0
    Price:
    $191.99
    Subtotal:
  • Non-Wastegated B3 LP Turbocharger For International With MAXXForce 11/13/15 Engine

    Non-Wastegated B3 LP Turbocharger For International With MAXXForce 11/13/15 Engine

    AREA DIESEL SERVICE

    $1,721.99
    Non-Wastegated B3 LP Turbocharger Fits International With MAXXForce 11/13/15 Engine* High Quality Turbo Charger* Borgwarner Turbo Charger* Natural Finish* Cast Iron Turbine Housing Material* Aluminum...
    09-070400012
    SKU:
    09-070400012
    Location:
    Made In USA
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Engine Parts
    $1,721.99
    Qty in Cart: 0
    Price:
    $1,721.99
    Subtotal:
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