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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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  • BESTfit Charge Air Cooler 43.11 X 18.4 X 1.6 Inch Replaces 15752110, 15843438 For GMC TopKick & Chevrolet Kodiak 2007-2009

    BESTfit Charge Air Cooler 43.11 X 18.4 X 1.6 Inch Replaces 15752110, 15843438 For GMC TopKick & Chevrolet Kodiak 2007-2009

    BESTFIT TRUCK PARTS

    $1,202.99
    Brazed Charge Air Cooler W/ 3 Inch Inlet & Outlet By BESTfit Replaces 15752110, 15843438Maintain peak performance in your GMC TopKick or Chevrolet Kodiak with the BESTfit 43.11 x 18.40 x 1.6 Inch...
    12-070110
    SKU:
    12-070110
    Truck Class:
    Heavy Duty
    Make:
    Mack
    Product Type:
    Engine Parts
    $1,202.99
    Qty in Cart: 0
    Price:
    $1,202.99
    Subtotal:
  • 110 Drawbar Eye W/ 8 Inch Pushrod

    110 Drawbar Eye W/ 8 Inch Pushrod

    PREMIER

    $415.99
    Weld-On Slack Reducing Drawbar Eye For Use W/ 2.5 Inch Round Tubing* High Quality Weld-On Slack Reducing Eye* Includes:  - Shoe  - Drawbar Eye  - 8 Inch Pushrod* Inside Diameter 2-3/8 Inch* Designed...
    09-051100767
    SKU:
    09-051100767
    Truck Class:
    Universal
    Rating:
    100000 LBS
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $415.99
    Qty in Cart: 0
    Price:
    $415.99
    Subtotal:
  • 110 Drawbar Eye W/ 12 Inch Pushrod

    110 Drawbar Eye W/ 12 Inch Pushrod

    PREMIER

    $415.99
    Weld-On Slack Reducing Drawbar Eye For Use W/ 2.5 Inch Round Tubing* High Quality Weld-On Slack Reducing Eye* Includes:  - Shoe  - Drawbar Eye  - 12 Inch Pushrod* Inside Diameter 2-3/8 Inch* Designed...
    09-051100768
    SKU:
    09-051100768
    Rating:
    100000 LBS
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $415.99
    Qty in Cart: 0
    Price:
    $415.99
    Subtotal:
  • 110 Drawbar Eye W/ 7 Inch Pushrod

    110 Drawbar Eye W/ 7 Inch Pushrod

    PREMIER

    $428.99
    Weld-On Slack Reducing Drawbar Eye For Use W/ 2.5 Inch Round Tubing* High Quality Weld-On Slack Reducing Eye* Includes:  - Shoe  - Drawbar Eye  - 7 Inch Pushrod* Inside Diameter 2-3/8 Inch* Designed...
    09-051100766
    SKU:
    09-051100766
    Rating:
    100000 LBS
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $428.99
    Qty in Cart: 0
    Price:
    $428.99
    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:
  • BESTfit Aluminum Fuel Tank 110 Gallon- 26 X 53 Inch- Center Fill W/ Early Style Manifold For Peterbilt 119 BBC & 127 BBC

    BESTfit Aluminum Fuel Tank 110 Gallon- 26 X 53 Inch- Center Fill W/ Early Style Manifold For Peterbilt 119 BBC & 127 BBC

    BESTFIT TRUCK PARTS

    $999.99
    110 Gallon- 26 X 53 Inch Aluminum Fuel Tank- Center Fill W/ Early Style Manifold By BESTfit Fits Peterbilt 119 BBC & 127 BBCThis BESTfit Fuel Tank Is Manufactured To Oe Specifications With The Same...
    01-060011003
    SKU:
    01-060011003
    Material Options:
    Aluminum
    Truck Class:
    Heavy Duty
    Length Options:
    48 Inch
    Shape Options:
    Cylindrical
    Product Type:
    Fuel Tanks
    Diameter Options:
    26 Inch
    Capacity:
    110 Gallons
    Position:
    Center Fill
    Make:
    Peterbilt
    Size Options:
    11 Gauge
    Type Options:
    Center Fill
    Ready To Ship:
    Yes
    $999.99
    Qty in Cart: 0
    Price:
    $999.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Trailer Air Valve Spring Brake Control Replaces RSL110500

    Trailer Air Valve Spring Brake Control Replaces RSL110500

    AUTOMANN USA

    $48.49
    Air Valve Spring Brake ControlMaintain precise trailer braking with the Trailer Air Valve Spring Brake Control. This high-quality air valve features dual 3/8-inch NPT delivery ports, a 3/8-inch NPT...
    110500
    SKU:
    110500
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Air, Electrical, & Safety
    $48.49
    Qty in Cart: 0
    Price:
    $48.49
    Subtotal:
  • Bimetal King Pin Bushing 1.91 ID, 2.05 OD, 2.5 Inch Replaces 5351110

    Bimetal King Pin Bushing 1.91 ID, 2.05 OD, 2.5 Inch Replaces 5351110

    AUTOMANN USA

    $24.16
    King Pin Bushing Replaces 5351110Protect your steering system with this Bimetal King Pin Bushing, replacing OEM part 5351110. Crafted from bimetal with a 1.91-inch ID, 2.05-inch OD, and 2.5-inch...
    29-05110202
    SKU:
    29-05110202
    Material Options:
    Steel
    Diameter Options:
    2 Inch
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $24.16
    Qty in Cart: 0
    Price:
    $24.16
    Subtotal:
  • FREE SHIPPING
    EGR Cooler Replaces 85110346 For Volvo VHD, VNL & VNM With D12 Volvo Engine

    EGR Cooler Replaces 85110346 For Volvo VHD, VNL & VNM With D12 Volvo Engine

    DAYTON / DORMAN

    $3,194.99
    EGR Cooler Fits Volvo VNL/VNM/VHD With Volvo D12 EngineKeep your Volvo VHD, VNL, or VNM diesel engine running clean and efficient with this stainless steel EGR Cooler, a direct OE replacement...
    13-0711001
    SKU:
    13-0711001
    Truck Class:
    Heavy Duty
    Make:
    Volvo
    Product Type:
    Engine Parts
    $3,194.99
    Qty in Cart: 0
    Price:
    $3,194.99
    Subtotal:
  • FREE SHIPPING
    Ductile Iron Spring Hanger 8 Inch C To C Driver/Passenger Side For Peterbilt 379 Rear Air Leaf Suspension Replaces 03-44586M001, 01-21518

    Ductile Iron Spring Hanger 8 Inch C To C Driver/Passenger Side For Peterbilt 379 Rear Air Leaf Suspension Replaces 03-44586M001, 01-21518

    AUTOMANN USA

    $415.99
    Driver/Passenger Side Ductile Iron Spring Hanger 8 Inch C To C Replaces 03-44586M001, 01-21518 Fits Peterbilt 379 Rear Air Leaf SuspensionThe Front Hanger replacement part is designed to provide...
    01-0509110
    SKU:
    01-0509110
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Frame & Chassis
    Position:
    Front Of Rear
    Material Options:
    Steel
    $415.99
    Qty in Cart: 0
    Price:
    $415.99
    Subtotal:
  • 66 Inch 304 Stainless Steel Long Front Half Fender W/ Rolled Edge

    66 Inch 304 Stainless Steel Long Front Half Fender W/ Rolled Edge

    TRUX ACCESSORIES

    $785.99
    23 X 24 X 66 Inch 14 Gauge Stainless Steel Standard Long Front Half FendersThis high quality 66 inch 304 14-gauge Stainless Steel Long Front Half Fender with a Rolled Edge is designed to fit 41 inch...
    09-11030229
    SKU:
    09-11030229
    Height Options:
    23 Inch
    Truck Class:
    Universal
    Length Options:
    66 Inch
    Width Options:
    24 Inch
    Material Options:
    Stainless Steel
    Size Options:
    14 Gauge
    Make:
    Universal Items
    Type Options:
    Half
    Finish Options:
    Polished
    Product Type:
    Rear Fenders
    $785.99
    Qty in Cart: 0
    Price:
    $785.99
    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 OVER $249
    Bostrom And National Seat Adapter Kit For Peterbilt & Kenworth

    Bostrom And National Seat Adapter Kit For Peterbilt & Kenworth

    BOSTROM TRUCK SEATS

    $103.99
    Seat Adapter Kit Fits Peterbilt & KenworthAre you installing a new seat in your truck? 4 State Trucks offers this quality retrofit seat adapter kit for use with Bostrom and National Seats to fit many...
    6205011001
    SKU:
    6205011001
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Seats
    Position:
    Kit Full
    Location:
    Made In USA
    $103.99
    Qty in Cart: 0
    Price:
    $103.99
    Subtotal:
  • Turnpike Truck Trim Stainless Steel Exterior Windshield Trim For Peterbilt With 2 Piece Windshields (3 Piece Kit)

    Turnpike Truck Trim Stainless Steel Exterior Windshield Trim For Peterbilt With 2 Piece Windshields (3 Piece Kit)

    TURNPIKE TRUCK TRIM

    $163.99
    Windshield Trim Wide On Bottom & Narrow On Top With No DimplesProtect your Peterbilt 2-piece windshield while enhancing style with the Turnpike Truck Trim Stainless Steel Exterior Windshield Trim...
    01-0911028
    SKU:
    01-0911028
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Product Type:
    Exterior
    Ready To Ship:
    Yes
    $163.99
    Qty in Cart: 0
    Price:
    $163.99
    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:
  • On Sale
    Limited Quantity Available
    Stainless Steel 27 X 24 Inch Quarter Fender Kit

    Stainless Steel 27 X 24 Inch Quarter Fender Kit

    TRUX ACCESSORIES

    Now: $224.99
    Was: $249.99
    27 X 24 Inch Quarter Fender Kit Stainless SteelThe 27-inch quarter fenders in the 16-gauge stainless steel premium series come with triangle mounting Arms clamps, mudflaps, and hardware.* High...
    09-110306062
    SKU:
    09-110306062
    Product Type:
    Rear Fenders
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Material Options:
    Stainless Steel
    Ready To Ship:
    Yes
    Now: $224.99
    Was: $249.99
    Qty in Cart: 0
    Price:
    Now: $224.99
    Was: $249.99
    Subtotal:
  • Total: items /

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