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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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  • 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:
  • 3 Layer Replacement Air Filter Wrap For 29-071300015 High Performance Air Filter For International 9000 Series & Peterbilt 348

    3 Layer Replacement Air Filter Wrap For 29-071300015 High Performance Air Filter For International 9000 Series & Peterbilt 348

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300015* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300017
    SKU:
    29-071300017
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • 1-Piece Stainless Steel Diesel Particulate Filter Replaces 4352922, 4352922NX For Cummins ISM Engine

    1-Piece Stainless Steel Diesel Particulate Filter Replaces 4352922, 4352922NX For Cummins ISM Engine

    GLOBAL EMISSIONS

    $1,924.99
    1-Piece Stainless Steel Diesel Particulate Filter Fits Cummins ISM Engine* High Quality Diesel Particulate Filter* Made Of Stainless Steel * Exclusive 1-Piece Canister Design For Durability* OEM...
    29-080600017
    SKU:
    29-080600017
    Truck Class:
    Heavy Duty
    Style Options:
    Cummins
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Exhaust
    $1,924.99
    Qty in Cart: 0
    Price:
    $1,924.99
    Subtotal:
  • High Flow Performance Air Filter W/ Washable Element For Freightliner, Kenworth, Peterbilt & Western Star - Pair

    High Flow Performance Air Filter W/ Washable Element For Freightliner, Kenworth, Peterbilt & Western Star - Pair

    FLEET FILTERS

    $839.99
    High Flow Performance Air Filter W/ Washable Element Fits Freightliner, Kenworth, Peterbilt, Western Star - PairYou never need to waste money on paper filters again! 4 State Trucks proudly offers...
    29-090500017
    SKU:
    29-090500017
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Exterior
    $839.99
    Qty in Cart: 0
    Price:
    $839.99
    Subtotal:
  • BESTfit 3 Leaf Parabolic Spring - 8,200 lbs Capacity For Peterbilt 375/377, 357/378 SFA & 379 Replaces 2001799

    BESTfit 3 Leaf Parabolic Spring - 8,200 lbs Capacity For Peterbilt 375/377, 357/378 SFA & 379 Replaces 2001799

    BESTFIT TRUCK PARTS

    $657.99
    3 Leaf Parabolic Spring W/ 8200 Lb. Capacity By BESTfit Replaces 2001799 Fits Replaces 2001799Restore your truck's suspension performance with the BESTfit 4 Inch Wide 3-Leaf Parabolic Spring,...
    01-050900017
    SKU:
    01-050900017
    Width Options:
    4 Inch
    Truck Class:
    Heavy Duty
    Product Type:
    Frame & Chassis
    Make:
    Peterbilt
    Rating:
    8000 LBS
    Material Options:
    Steel
    $657.99
    Qty in Cart: 0
    Price:
    $657.99
    Subtotal:
  • FREE SHIPPING OVER $249
    U-Bolt Kit 7/8 X 5.25 X 15.5 Inch Replaces 11-23583-001 & 681-325-03-25 For Freightliner FAS II Suspension

    U-Bolt Kit 7/8 X 5.25 X 15.5 Inch Replaces 11-23583-001 & 681-325-03-25 For Freightliner FAS II Suspension

    BESTFIT TRUCK PARTS

    $54.99
    U Bolt Kit Includes Washers & Nuts For Freightliner FAS II Suspension* High Quality U Bolt Kit* Includes:  - (2) U Bolts (Specialty Bend)* Dimensions:  - 15.5 Inch Length  - 5.25 Inch Width  - 7/8...
    03-051017
    SKU:
    03-051017
    Width Options:
    5 Inch
    Length Options:
    15 Inch
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Frame & Chassis
    $54.99
    Qty in Cart: 0
    Price:
    $54.99
    Subtotal:
  • DEF Urea Filter Kit For Cummins ISL, ISB, ISC & PACCAR PX-6, PX-7, PX-9 Engine Replaces 1927474PE, 2014774PE, 21496419

    DEF Urea Filter Kit For Cummins ISL, ISB, ISC & PACCAR PX-6, PX-7, PX-9 Engine Replaces 1927474PE, 2014774PE, 21496419

    DAYTON / DORMAN

    $55.99
    Diesel Exhaust Fluid Urea Filter Kit Replaces 1927474PE, 2014774PE, 21496419 Fits Cummins & PACCAR EngineImprove emissions system reliability with this DEF Urea Filter Kit for Cummins and PACCAR...
    29-06070017
    SKU:
    29-06070017
    Style Options:
    Paccar
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $55.99
    Qty in Cart: 0
    Price:
    $55.99
    Subtotal:
  • FREE SHIPPING OVER $249
    34 X 57MM Rubber/Metal Intake Manifold Gasket Kit - Replaces 12529094, 8-12529-094-0, 8-89017-465-0

    34 X 57MM Rubber/Metal Intake Manifold Gasket Kit - Replaces 12529094, 8-12529-094-0, 8-89017-465-0

    DAYTON / DORMAN

    $125.99
    34 X 57MM Rubber/Metal Intake Manifold Gasket Kit* High Quality Intake Manifold Gasket Kit* Metal And Rubber* Includes  - Upper And Lower Manifold Gaskets  - Valve Cover Caskets  - 8 Intake Bolts...
    29-071200017
    SKU:
    29-071200017
    Truck Class:
    Heavy Duty
    Make:
    Isuzu
    Product Type:
    Engine Parts
    $125.99
    Qty in Cart: 0
    Price:
    $125.99
    Subtotal:
  • 32 Inch Nylon 11 Blade Fan Blade Replaces 3809753C1, 3809753C2, 47354461001, 85138, 010023828 For Cummins ISX, Caterpillar C13 Engines

    32 Inch Nylon 11 Blade Fan Blade Replaces 3809753C1, 3809753C2, 47354461001, 85138, 010023828 For Cummins ISX, Caterpillar C13 Engines

    AUTOMANN USA

    $312.99
    32 Inch Fan Blade- 11 BladesProtect your engine from overheating with this durable 32 Inch Nylon 11 Blade Fan Blade, replacement for Cummins ISX and Caterpillar C13 trucks. Featuring 11 nylon blades,...
    29-07060178
    SKU:
    29-07060178
    Diameter Options:
    32 Inch
    Product Type:
    Engine Parts
    Material Options:
    Nylon
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $312.99
    Qty in Cart: 0
    Price:
    $312.99
    Subtotal:
  • OPP Fiberglass Hood Shell - Replaces A17-20220-017 For Western Star 5700XE 2016-2021

    OPP Fiberglass Hood Shell - Replaces A17-20220-017 For Western Star 5700XE 2016-2021

    OPP - ORIGINAL PARTS PROGRAM

    $12,321.99
    Western Star 5700XE Hood* High Quality Hood* Made In USA* Sold Individually* Warranty On Hoods Against Defects In Workmanship & Material From Date Of Purchase*|** This Is An OEM Replacement Part/ Not...
    14-12503
    SKU:
    14-12503
    Truck Class:
    Heavy Duty
    Material Options:
    Fiberglass
    Make:
    Western Star
    Finish Options:
    Paintable
    Location:
    Made In USA
    Product Type:
    Hood Shell
    $12,321.99
    Qty in Cart: 0
    Price:
    $12,321.99
    Subtotal:
  • 3 Inch Stainless Cab Panel W/ 11 Total Amber/Amber P1 Lights For Peterbilt 389 131 BBC - Pair

    3 Inch Stainless Cab Panel W/ 11 Total Amber/Amber P1 Lights For Peterbilt 389 131 BBC - Pair

    PHOENIX DESIGN

    $354.99
    Cab Panels W/ 11 Total Amber LED Amber Lens P1 Lights Fits Peterbilt 389 Extended HoodUpgrade the functionality and appearance of your Peterbilt 389 or 131 BBC with these 3-inch stainless steel cab...
    01-091200170
    SKU:
    01-091200170
    Light Options:
    With Lights
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    47 Inch
    Product Type:
    Exterior
    $354.99
    Qty in Cart: 0
    Price:
    $354.99
    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:
  • 3 Inch Stainless Cab Panel W/ 11 Total Amber/Amber P3 Lights For Peterbilt 389 131 BBC - Pair

    3 Inch Stainless Cab Panel W/ 11 Total Amber/Amber P3 Lights For Peterbilt 389 131 BBC - Pair

    PHOENIX DESIGN

    $354.99
    Cab Panels W/ 11 Total Amber LED Amber Lens P3 Lights Fits Peterbilt 389 Extended HoodOutfit your Peterbilt 389 with these premium 3 Inch Stainless Steel Cab Panels, designed for truckers who demand...
    01-091200172
    SKU:
    01-091200172
    Truck Class:
    Heavy Duty
    Light Options:
    With Lights
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    47 Inch
    Product Type:
    Exterior
    $354.99
    Qty in Cart: 0
    Price:
    $354.99
    Subtotal:
  • 3 Inch Stainless Cab Panel W/ 11 Total Amber/Clear P3 Lights For Peterbilt 389 131 BBC - Pair

    3 Inch Stainless Cab Panel W/ 11 Total Amber/Clear P3 Lights For Peterbilt 389 131 BBC - Pair

    PHOENIX DESIGN

    $308.99
    Cab Panels W/ 11 Total Amber LED Clear Lens P3 Lights Fits Peterbilt 389 Extended HoodLight up the road with confidence by upgrading your Peterbilt 389 with these 3 Inch Stainless Steel Cab Panels,...
    01-091200173
    SKU:
    01-091200173
    Location:
    Made In USA
    Light Options:
    With Lights
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    47 Inch
    Product Type:
    Exterior
    $308.99
    Qty in Cart: 0
    Price:
    $308.99
    Subtotal:
  • BESTfit Wear Pad 3-1/8 ID X 1-11/32 OD Inch - 1160009 For Ridewell Lift

    BESTfit Wear Pad 3-1/8 ID X 1-11/32 OD Inch - 1160009 For Ridewell Lift

    BESTFIT TRUCK PARTS

    $8.09
    BESTfit 1/4 Inch Thick Ridewell Wear Pad, Replaces 1160009* High Quality Wear Pad* 3-1/8 Inch Washer OD* 1-11/32 Inch Washer ID* 1/4 Inch Thickness* Suspension Type* Ridewell Application* Sold...
    19-05180017
    SKU:
    19-05180017
    Material Options:
    Steel
    Diameter Options:
    1 Inch
    Truck Class:
    Heavy Duty
    Make:
    Trailer
    Product Type:
    Trailer
    $8.09
    Qty in Cart: 0
    Price:
    $8.09
    Subtotal:
  • 3 Inch Stainless Cab Panel W/ 11 Total Amber/Amber 2 Inch Round Lights For Peterbilt 389 131 BBC - Pair

    3 Inch Stainless Cab Panel W/ 11 Total Amber/Amber 2 Inch Round Lights For Peterbilt 389 131 BBC - Pair

    PHOENIX DESIGN

    $308.99
    Cab Panels W/ 11 Total Amber LED Amber Lens 2 Inch Round Lights Fits Peterbilt 389 Extended HoodDrive with confidence and style with this 3 Inch Stainless Cab Panel set featuring 11 total Amber/Amber...
    01-091200174
    SKU:
    01-091200174
    Truck Class:
    Heavy Duty
    Light Options:
    With Lights
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    47 Inch
    Product Type:
    Exterior
    $308.99
    Qty in Cart: 0
    Price:
    $308.99
    Subtotal:
  • 3 Inch Stainless Cab Panel W/ 11 Total Amber/Clear 2 Inch Round Lights For Peterbilt 389 131 BBC - Pair

    3 Inch Stainless Cab Panel W/ 11 Total Amber/Clear 2 Inch Round Lights For Peterbilt 389 131 BBC - Pair

    PHOENIX DESIGN

    $308.99
    Cab Panels W/ 11 Total Amber LED Clear Lens 2 Inch Round Lights Fits Peterbilt 389 Extended HoodShine brighter and drive safer with this 3 Inch Stainless Steel Cab Panel set, featuring 11 Amber/Clear...
    01-091200175
    SKU:
    01-091200175
    Location:
    Made In USA
    Light Options:
    With Lights
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    47 Inch
    Product Type:
    Exterior
    $308.99
    Qty in Cart: 0
    Price:
    $308.99
    Subtotal:
  • 3 Inch Stainless Cab Panel W/ 11 Total 5/6 Amber/Clear P1 Lights For Peterbilt 389 131 BBC - Pair

    3 Inch Stainless Cab Panel W/ 11 Total 5/6 Amber/Clear P1 Lights For Peterbilt 389 131 BBC - Pair

    PHOENIX DESIGN

    $347.99
    Cab Panels W/ 11 Total Amber LED Clear Lens 5/6 P1 Lights Fits Peterbilt 389 Extended HoodMaximize both style and safety on your Peterbilt 389 with these 3 Inch Stainless Steel Cab Panels with 11...
    01-091200171
    SKU:
    01-091200171
    Location:
    Made In USA
    Light Options:
    With Lights
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Finish Options:
    Polished
    Length Options:
    47 Inch
    Product Type:
    Exterior
    Color:
    Amber/Clear
    Height Options:
    3 Inch
    $347.99
    Qty in Cart: 0
    Price:
    $347.99
    Subtotal:
  • King Pin Kit Replaces 8885857, 3927943, 3838390 For GMC Brigadier

    King Pin Kit Replaces 8885857, 3927943, 3838390 For GMC Brigadier

    AFTERMARKET

    $149.99
    King Pin Kit W/ 1.25 X 7.88 Inch King Pin & Bi-Metal BushingsMaintain optimal steering performance with this premium King Pin Kit for GMC Brigadier. Featuring single draw key king pins, bi-metal...
    29-05090176
    SKU:
    29-05090176
    Position:
    Kit Full
    Length Options:
    7 3/4 Inch
    Height Options:
    1 Inch
    Product Type:
    Frame & Chassis
    Make:
    GMC
    $149.99
    Qty in Cart: 0
    Price:
    $149.99
    Subtotal:
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