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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

    The Best Semi Truck Half Fenders for Your Big Rig(Post)

    Upgrading and customizing your truck is part of a long-term vision. After your bumpers and hoods, add some fenders - more specifically: half fenders.  Semi truck half fenders are an exceptional way to

    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

    How to Install Rear Fenders on a Peterbilt 379(Post)

    The process of installing rear fenders on a semi truck, specifically a Peterbilt 379 model, will depend on the type of fender. Whether it’s a full fender or half fender, the difference comes down to:

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  • Gen III High Flow Performance Air Filter With Washable Element Media PACCAR T680, T880, 579

    Gen III High Flow Performance Air Filter With Washable Element Media PACCAR T680, T880, 579

    FLEET FILTERS

    $585.99
    Gen III High Performance Air Filter Media PACCAR T680, T880, 579You never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable,...
    29-071300042
    SKU:
    29-071300042
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $585.99
    Qty in Cart: 0
    Price:
    $585.99
    Subtotal:
  • 1-Piece Stainless Steel Diesel Particulate Filter Replaces A6804910894 For Detroit DD13, DD15 Engines

    1-Piece Stainless Steel Diesel Particulate Filter Replaces A6804910894 For Detroit DD13, DD15 Engines

    GLOBAL EMISSIONS

    $1,266.99
    1-Piece Stainless Steel Diesel Particulate Filter Fits Detroit DD13 & DD15 Engines* High Quality Diesel Particulate Filter* Made Of Stainless Steel * Exclusive 1-Piece Canister Design For Durability*...
    29-080600042
    SKU:
    29-080600042
    Truck Class:
    Heavy Duty
    Style Options:
    Detroit
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $1,266.99
    Qty in Cart: 0
    Price:
    $1,266.99
    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:
  • Rear Of Front Hanger Replaces 1614991000, 16-14991-000, 1614991002, 16-14991-002, 6803201070, 680-320-10-70, 6803220803, 680-322-08-03, 6813201170, 681-320-11-70, A1614221000, A16-14221-000 For Freightliner, Western Star

    Rear Of Front Hanger Replaces 1614991000, 16-14991-000, 1614991002, 16-14991-002, 6803201070, 680-320-10-70, 6803220803, 680-322-08-03, 6813201170, 681-320-11-70, A1614221000, A16-14221-000 For Freightliner, Western Star

    AFTERMARKET

    $136.99
    3.875 Inch Rear Of Front HangerUpgrade or replace your truck's front suspension with this Rear of Front Hanger for Freightliner and Western Star. This left and right hanger includes a bimetal bushing...
    29-05090042
    SKU:
    29-05090042
    Product Type:
    Frame & Chassis
    Make:
    Western Star
    Make:
    Freightliner
    $136.99
    Qty in Cart: 0
    Price:
    $136.99
    Subtotal:
  • BESTfit Blind Mount 22 Inch Stainless Texas Hand Formed Bumper, 11 Gauge With Mounting Plates

    BESTfit Blind Mount 22 Inch Stainless Texas Hand Formed Bumper, 11 Gauge With Mounting Plates

    BESTFIT TRUCK PARTS

    $1,100.99 - $1,121.99
    Optimize your truck with the BESTfit 22-inch stainless steel Texas hand formed bumper with blind mounting plates. Constructed from 11-gauge #8 finish non-magnetic stainless steel, this heavy-duty...
    PPR_204228
    SKU:
    PPR_204228
    Height Options:
    22 Inch
    Make:
    Kenworth
    Light Options:
    Without Lights
    Make:
    Peterbilt
    Truck Class:
    Heavy Duty
    Style Options:
    Texas Hand Formed
    Size Options:
    11 Gauge
    Material Options:
    Stainless Steel
    Type Options:
    Blind Mount
    Product Type:
    Bumpers
    $1,100.99 - $1,121.99
    Qty in Cart: 0
    Price:
    $1,100.99 - $1,121.99
    Subtotal:
  • 3 Inch Stainless Steel Cab Panels W/ 11 Total 2 Inch Round Light Holes For Peterbilt 389 131 BBC 2011

    3 Inch Stainless Steel Cab Panels W/ 11 Total 2 Inch Round Light Holes For Peterbilt 389 131 BBC 2011

    PHOENIX DESIGN

    $176.99
    3 Inch Cab Panels W/ 11 Total 2 Inch Round Light Holes Fits Peterbilt 389 131 BBCBuilt for truckers who demand quality, these 3 Inch Stainless Steel Cab Panels with 11 Total 2 Inch Round Light Holes...
    01-091200420
    SKU:
    01-091200420
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    47 Inch
    Light Options:
    Without Lights
    Product Type:
    Exterior
    $176.99
    Qty in Cart: 0
    Price:
    $176.99
    Subtotal:
  • BESTfit Blind Mount 18 Inch Stainless Texas Boxed End Bumper, 11 Gauge With Mounting Plates

    BESTfit Blind Mount 18 Inch Stainless Texas Boxed End Bumper, 11 Gauge With Mounting Plates

    BESTFIT TRUCK PARTS

    $955.99 - $1,091.99
    Restore proper front-end support on your Freightliner Cascadia 116 or 126 with the BESTfit bumper mounting bracket. Manufactured from stainless steel, this aftermarket bracket is built to help...
    PPR_204221
    SKU:
    PPR_204221
    Truck Class:
    Heavy Duty
    Light Options:
    Without Lights
    Make:
    Kenworth
    Height Options:
    18 Inch
    Make:
    Peterbilt
    Style Options:
    Texas Boxed End
    Size Options:
    11 Gauge
    Material Options:
    Stainless Steel
    Type Options:
    Blind Mount
    Product Type:
    Bumpers
    $955.99 - $1,091.99
    Qty in Cart: 0
    Price:
    $955.99 - $1,091.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Fleet Charge Pre-Mixed 50/50 Coolant- 1 Gallon

    Fleet Charge Pre-Mixed 50/50 Coolant- 1 Gallon

    PARTS DISTRIBUTING

    $13.30
    Antifreeze Fleet Charge Radiator CoolantRegulate the temperature in heavy duty diesel, gasoline, and natural gas engines with this high quality Fleet Coolant/Antifreeze. It is the original fully...
    09-0702042
    SKU:
    09-0702042
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Capacity:
    1 Gallon
    Ready To Ship:
    Yes
    $13.30
    Qty in Cart: 0
    Price:
    $13.30
    Subtotal:
  • 2 Inch Stainless Steel Round Bezel - Flange Mount

    2 Inch Stainless Steel Round Bezel - Flange Mount

    AFTERMARKET

    $65,536.00
    SS Flange Mount Bezel W/ 3 Hidden Studs Fits 2 Inch Round Lights* High Quality Round Bezel* Made Of Stainless Steel* Flange Mount* With 3 Hidden Studs* For 2 Inch LED Lights* Sold Individually*...
    09-1610042
    SKU:
    09-1610042
    Truck Class:
    Universal
    Shape Options:
    Round
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Diameter Options:
    2 Inch
    Product Type:
    Lighting
    $65,536.00
    Qty in Cart: 0
    Price:
    $65,536.00
    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
    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
    $38.75
    Qty in Cart: 0
    Price:
    $38.75
    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:
  • Shiftopperz Amber Dragon Ball Z Shift Knob W/ Stars - 2 1/8 Inch Diameter

    Shiftopperz Amber Dragon Ball Z Shift Knob W/ Stars - 2 1/8 Inch Diameter

    TWISTED SHIFTERZ

    $67.99 - $82.99
    Upgrade your interior styling with the ShifTopperz Amber Dragon Ball Z Shift Knob featuring a 2 1/8 inch diameter and signature seven-star design. This high-quality aftermarket shift knob is designed...
    PPR_204278
    SKU:
    PPR_204278
    Location:
    Made In USA
    Truck Class:
    Universal
    Shape Options:
    Round
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Interior
    $67.99 - $82.99
    Qty in Cart: 0
    Price:
    $67.99 - $82.99
    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
    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:
  • BESTfit DPF For Volvo & Mack Replaces 82014, C095SA, P239814

    BESTfit DPF For Volvo & Mack Replaces 82014, C095SA, P239814

    BESTFIT TRUCK PARTS

    $2,331.99
    DPF By BESTfit Replaces 82014, C095SA, P239814 Fits Volvo & MackBuilt for durability and efficiency, the BESTfit Volvo/Mack Diesel Particulate Filter (DPF) replaces OEM part numbers 82014, C095SA,...
    29-08090042
    SKU:
    29-08090042
    Product Type:
    Exhaust
    Make:
    Mack
    Make:
    Volvo
    $2,331.99
    Qty in Cart: 0
    Price:
    $2,331.99
    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:
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