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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

    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

    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

    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

    Blatant Signs Your Turbocharger is Failing (And When to Replace it) (Post)

    If your semi truck turbocharger is failing, you'll encounter a few common signs. In this post, we'll cover what those are, and similar symptoms that aren't actually the turbo, but a related part.  Sig

    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

    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

    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

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  • BESTfit Detroit 60 Series Flywheel SAE 1 23514177, 23511177, 23509709

    BESTfit Detroit 60 Series Flywheel SAE 1 23514177, 23511177, 23509709

    BESTFIT TRUCK PARTS

    $432.99
    BESTfit Flywheel With 10 Inch Opening, 20 Inch OD Ring Gear With 118 TeethThis high quality flywheel SAE 1 that fits the Detroit 60 series has a ring gear with 118 teeth, it has 12 bolt mounting...
    29-0723514177
    SKU:
    29-0723514177
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Diameter Options:
    20 Inch
    Style Options:
    Flat
    $432.99
    Qty in Cart: 0
    Price:
    $432.99
    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:
  • 1/2 X 1/2 Inch Brass Hose Coupling W/ Spring Replaces E8594

    1/2 X 1/2 Inch Brass Hose Coupling W/ Spring Replaces E8594

    AUTOMANN USA

    $13.67
    1/2 X 1/2 Inch Hose Coupling W/ SpringKeep your air brake system functioning properly with the 1/2 x 1/2 Inch Brass Hose Coupling with Spring. Built to replace E8594, it features a secure 1/2-inch...
    09-05170177
    SKU:
    09-05170177
    Material Options:
    Brass
    Diameter Options:
    1/2 Inch
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $13.67
    Qty in Cart: 0
    Price:
    $13.67
    Subtotal:
  • Merritt Diamond Plate Aluminum Super Duty Half Fender 48.5 Inch

    Merritt Diamond Plate Aluminum Super Duty Half Fender 48.5 Inch

    MERRITT

    $547.99
    27 X 22 X 48.5 Inch Diamond Plate Aluminum Super Duty Half Fender By MerrittCombine durability, style, and functionality with the Merritt 48.5 Inch Diamond Plate Aluminum Super Duty Half Fender...
    177
    SKU:
    177
    Height Options:
    22 Inch
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Length Options:
    48 Inch
    Width Options:
    27 Inch
    Finish Options:
    Diamond Plate
    Product Type:
    Rear Fenders
    Ready To Ship:
    Yes
    Type Options:
    Half Fender
    Material Options:
    Aluminum Alloy
    Location:
    Made In USA
    $547.99
    Qty in Cart: 0
    Price:
    $547.99
    Subtotal:
  • FREE SHIPPING
    4 X 6 Evolution 2 LED Headlight W/ Black Bezel

    4 X 6 Evolution 2 LED Headlight W/ Black Bezel

    AFTERMARKET

    $428.99
    Model 8800 LED Headlight* High Quality Headlights* 4 X 6* 12-24V Dot/Ece LED High Beamheated With Black Bezel* Outer Lens Material- Hardcoated Polycarbonate* Outer Lens Color -Clear* Housing...
    29-1606177
    SKU:
    29-1606177
    Lumens:
    2001 to 4999 Lumens
    Color:
    Black
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Lighting
    $428.99
    Qty in Cart: 0
    Price:
    $428.99
    Subtotal:
  • Black Rubber Eagle Of Red Fire Mud Flaps 24 X 30 Inch

    Black Rubber Eagle Of Red Fire Mud Flaps 24 X 30 Inch

    AFTERMARKET

    $73.99
    24 X 30 Inch Bald Eagle Of Fire W/ Red FlamesThis pair of rubber mud flaps with an eagle and flame design mount behind your tires to prevent small debris from flying up into the air caused by them...
    09-0507177
    SKU:
    09-0507177
    Height Options:
    30 Inch
    Truck Class:
    Universal
    Width Options:
    24 Inch
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Mud Flaps
    $73.99
    Qty in Cart: 0
    Price:
    $73.99
    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
    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:
  • Roadworks 19.5 Inch Stainless Steel Front Air Cleaner Panels For Peterbilt 378 & 379 W/ 15 Inch Vortox Or Donaldson

    Roadworks 19.5 Inch Stainless Steel Front Air Cleaner Panels For Peterbilt 378 & 379 W/ 15 Inch Vortox Or Donaldson

    ROADWORKS

    $126.99
    19.5 Inch Stainless Steel Front Air Cleaner Panels By Roadworks Fits Peterbilt 378 & 379 W/ 15 Inch Vortox Or DonaldsonGive your rig a clean, polished look with these 19.5 Inch Stainless Steel Blank...
    01-090500177
    SKU:
    01-090500177
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Position:
    Front
    Product Type:
    Exterior
    $126.99
    Qty in Cart: 0
    Price:
    $126.99
    Subtotal:
  • Stainless Steel Wide Cowl Panels W/ 8 - 2 Inch Round Amber/Amber LEDs For Peterbilt 389 131BBC

    Stainless Steel Wide Cowl Panels W/ 8 - 2 Inch Round Amber/Amber LEDs For Peterbilt 389 131BBC

    PHOENIX DESIGN

    $290.99
    Stainless Steel Wide Cowl Panels W/ 8 - 2 Inch Round Amber LED Amber Lens Lights Fit Peterbilt 389 131BBC* High Quality Cowl Panel* Made Of 304 Stainless Steel* Wide* 4 - 2 Inch Round Lights Per Side...
    01-091201177
    SKU:
    01-091201177
    Location:
    Made In USA
    Light Options:
    With Lights
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    24 Inch
    Product Type:
    Exterior
    $290.99
    Qty in Cart: 0
    Price:
    $290.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    FREE SHIPPING OVER $249
    12-10 AWG Yellow Crimp Seal Heat Shrink Spade Terminal For NO. 10 Stud - 10 PCS

    12-10 AWG Yellow Crimp Seal Heat Shrink Spade Terminal For NO. 10 Stud - 10 PCS

    AFTERMARKET

    Now: $2.42
    Was: $9.81
    12-10 AWG Heat Shrink Spade Terminal For NO. 10 Stud - 10 PCS* High Quality Heat Shrink Spade Terminal* Yellow* 10 Pieces* 12-10 AWG * No. 10 Stud * Adhesive-Lined To Seal The Connection* The...
    09-16030177
    SKU:
    09-16030177
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Air, Electrical, & Safety
    Ready To Ship:
    Yes
    Now: $2.42
    Was: $9.81
    Qty in Cart: 0
    Price:
    Now: $2.42
    Was: $9.81
    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:
  • Air Spring Rolling Lobe With Steel Base 9235, 9265, W013589235 For Hendrickson Trailer

    Air Spring Rolling Lobe With Steel Base 9235, 9265, W013589235 For Hendrickson Trailer

    AFTERMARKET

    $169.99
    Replacement Air Spring Rolling Lobe* High Quality Air Spring* Rolling Lobe Type* Bumper: Yes* 5500 Lb Load At 80 PSI* 7000 Lb Load At 100 PSI* 61 CPM Natural Frequency* Top Plate:  - 9.00 Inch...
    19-05180177
    SKU:
    19-05180177
    Truck Class:
    Heavy Duty
    Product Type:
    Trailer
    Make:
    Trailer
    $169.99
    Qty in Cart: 0
    Price:
    $169.99
    Subtotal:
  • 4 Inch SS Sleeper Extensions With 8 - 2 Inch Round Amber/Clear LEDs For Peterbilt With 36/44/63/72 Inch Unibilt Sleeper

    4 Inch SS Sleeper Extensions With 8 - 2 Inch Round Amber/Clear LEDs For Peterbilt With 36/44/63/72 Inch Unibilt Sleeper

    PHOENIX DESIGN

    $222.99
    4 Inch Stainless Sleeper Panels Fits Peterbilt W/ 36/44/48/58/63/72 Inch Unibilt Sleeper With Extenders* High Quality Sleeper Extension Panels* Made of high quality 304 Stainless Steel* 4 Inch * Kit...
    01-101200177
    SKU:
    01-101200177
    Height Options:
    4 Inch
    Location:
    Made In USA
    Light Options:
    With Lights
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Product Type:
    Exterior
    $222.99
    Qty in Cart: 0
    Price:
    $222.99
    Subtotal:
  • Textured Black RB10 Running Boards For Ford F150, F250 & F350 Super Cab 2015-Current

    Textured Black RB10 Running Boards For Ford F150, F250 & F350 Super Cab 2015-Current

    GO RHINO

    $669.99
    Go Rhino 63417780PC RB10 Running Boards Plus Brackets Complete Kit* High Quality Running Boards* Cab Length Running Boards For Popular Crew Cab And Extended Cab Trucks* Includes Mounting Brackets For...
    63417780PC
    SKU:
    63417780PC
    Truck Class:
    Light Duty
    Color:
    Black
    Material Options:
    Steel
    Make:
    Ford
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $669.99
    Qty in Cart: 0
    Price:
    $669.99
    Subtotal:
  • Textured Black RB20 Running Boards For Ford F150, F250 & F350 Super Cab 2015-Current

    Textured Black RB20 Running Boards For Ford F150, F250 & F350 Super Cab 2015-Current

    GO RHINO

    $555.50
    Go Rhino 69417780PC RB20 Running Boards Plus Brackets Complete Kit* High Quality Running Boards* Cab Length Running Boards For Popular Crew Cab And Extended Cab Trucks* Includes Mounting Brackets For...
    69417780PC
    SKU:
    69417780PC
    Color:
    Black
    Truck Class:
    Light Duty
    Material Options:
    Steel
    Make:
    Ford
    Finish Options:
    Galvanized
    Product Type:
    Frame & Chassis
    $555.50
    Qty in Cart: 0
    Price:
    $555.50
    Subtotal:
  • FREE SHIPPING
    BLEMISHED: CSM Fiberglass AC Custom Cover For Peterbilt 375, 377, 378, 379 & 385

    BLEMISHED: CSM Fiberglass AC Custom Cover For Peterbilt 375, 377, 378, 379 & 385

    4 STATE TRUCKS

    $297.99
    Chrome Shop Mafia AC Custom Cover Fits PeterbiltNormally $397.99 Plus Shipping, Buy This One Now For $297.99 with Free Shipping! You Save $100+ Plus Shipping Cost!***CHIP IN THE TOP CORNER******MINOR...
    ZB10001772
    SKU:
    ZB10001772
    Truck Class:
    Heavy Duty
    Material Options:
    Fiberglass
    Make:
    Peterbilt
    $297.99
    Qty in Cart: 0
    Price:
    $297.99
    Subtotal:
  • Isspro EV2 2-1/16 Inch Drive Oil Pressure Gauge Kit 0-400 PSI With Built In Warning Light

    Isspro EV2 2-1/16 Inch Drive Oil Pressure Gauge Kit 0-400 PSI With Built In Warning Light

    ISSPRO

    $266.99
    Drive Oil Pressure Gauge Kit 0-400 PSI* High Quality Drive Oil Pressure Gauge Kit* 2 1/16 Inch* 0-400 Psi * Built In Warning Light* Made In USA* Sold Individually* Warranty On Drive Oil Pressure...
    09-15020177
    SKU:
    09-15020177
    Product Type:
    Interior
    Make:
    Universal Items
    $266.99
    Qty in Cart: 0
    Price:
    $266.99
    Subtotal:
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