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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

    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

    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

    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

    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

    Semi-Truck Mattress Sizes: Fitment Chart & Buying Guide(Post)

    Looking for the right sized semi truck mattress? Every long-haul trucker should prioritize spending a sizeable portion of their budget on a quality mattress and driver's seat. That's where you spend

    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

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  • BESTfit Black Steel Center Bumper Section W/ Tow Holes Replaces 21-26020-011 For Freightliner Columbia

    BESTfit Black Steel Center Bumper Section W/ Tow Holes Replaces 21-26020-011 For Freightliner Columbia

    BESTFIT TRUCK PARTS

    $303.99
    BESTfit Painted Steel Center Bumper W/ Round Tow, Pin Holes In Upper FaceThis BESTfit old style black center bumper is made of a strong stainless steel and has round tow pin holes in the upper face...
    03-010112
    SKU:
    03-010112
    Truck Class:
    Heavy Duty
    Position:
    Center
    Material Options:
    Steel
    Make:
    Freightliner
    Product Type:
    Bumpers
    Ready To Ship:
    Yes
    $303.99
    Qty in Cart: 0
    Price:
    $303.99
    Subtotal:
  • Stainless Front Air Cleaner Panels W/ 12 P3 Amber/Clear LEDs For Freightliner Classic XL W/ 11 Inch Nelson

    Stainless Front Air Cleaner Panels W/ 12 P3 Amber/Clear LEDs For Freightliner Classic XL W/ 11 Inch Nelson

    PHOENIX DESIGN

    $339.99
    Front Air Cleaner Panels W/ 12 P3 Amber LED Clear Lens Lights Fit Freightliner Classic XL W/ 11 Inch Nelson* High Quality Front Air Cleaner Panel * Made Of 304 Stainless Steel * 6 P3 Lights Per Side*...
    03-090500011
    SKU:
    03-090500011
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Freightliner
    Finish Options:
    Polished
    Light Options:
    With Lights
    Position:
    Front
    Product Type:
    Exterior
    $339.99
    Qty in Cart: 0
    Price:
    $339.99
    Subtotal:
  • High Flow Performance Air Filter With Washable Element Media For Kenworth, Peterbilt 372 & 379 - Pair

    High Flow Performance Air Filter With Washable Element Media For Kenworth, Peterbilt 372 & 379 - Pair

    FLEET FILTERS

    $839.99
    High Performance Air Filter Media Fits Kenworth, Peterbilt 372, 379 - PairYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime,...
    29-090500011
    SKU:
    29-090500011
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Exterior
    $839.99
    Qty in Cart: 0
    Price:
    $839.99
    Subtotal:
  • FREE SHIPPING
    BESTfit Aluminum Upper Fuel Tank Mounting Bracket For Peterbilt W/ 26 Inch Diameter Tanks Replaces 11-04855M000, 1104855M000

    BESTfit Aluminum Upper Fuel Tank Mounting Bracket For Peterbilt W/ 26 Inch Diameter Tanks Replaces 11-04855M000, 1104855M000

    BESTFIT TRUCK PARTS

    $335.99
    Aluminum Upper Fuel Tank Mounting Bracket For 26 Inch Diameter Fuel Tanks By BESTfit Replaces 11-04855M000, 1104855M000 Fits Peterbilt W/ 26 Inch Diameter TanksUpgrade your Peterbilt with this...
    01-0601011
    SKU:
    01-0601011
    Truck Class:
    Heavy Duty
    Product Type:
    Fuel Tanks
    Material Options:
    Aluminum
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    Position:
    Upper
    Diameter Options:
    26 Inch
    $335.99
    Qty in Cart: 0
    Price:
    $335.99
    Subtotal:
  • Merritt Aluminum Cab Rack W/ 2 Enclosures 80 X 68 X 11 Inch

    Merritt Aluminum Cab Rack W/ 2 Enclosures 80 X 68 X 11 Inch

    MERRITT

    $4,593.99
    Aluminum Cab Rack W/ Jail Bar WindowKeep your cab protected and your gear organized with the Merritt 68 x 80 Inch Aluminum Cab Rack. Equipped with two enclosures with chain racks and a 27" x 23" jail...
    320381M0115
    SKU:
    320381M0115
    Height Options:
    68 Inch
    Width Options:
    80 Inch
    Material Options:
    Aluminum
    Product Type:
    Cargo Control
    Location:
    Made In USA
    Make:
    Universal Items
    Length Options:
    11 Inch
    $4,593.99
    Qty in Cart: 0
    Price:
    $4,593.99
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  • High Pressure AC Switch - 18-03600, 11-1406, 1460 For Kenworth, Peterbilt

    High Pressure AC Switch - 18-03600, 11-1406, 1460 For Kenworth, Peterbilt

    AFTERMARKET

    $83.99
    High Pressure AC Switch* High Quality High Pressure AC Switch* 8 1/2 Inch Length* 2 Pin* Sensors / Switches Control The AC Compressor* Fan And Expansion Valve For An Efficiently Functioning Air...
    29-07100011
    SKU:
    29-07100011
    Material Options:
    Plastic/Poly
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $83.99
    Qty in Cart: 0
    Price:
    $83.99
    Subtotal:
  • FREE SHIPPING OVER $249
    TPHD 2.25 Inch Oil Filler Cap W/ T Handle For Cummins

    TPHD 2.25 Inch Oil Filler Cap W/ T Handle For Cummins

    TPHD

    $34.66
    Oil Filler Cap By TPHD* High Quality Expandable Metal - Rubber Cap* Fits 2.25 Inch ID Oil Filler Hole* For Cummins Engines* Sold Individually* Warranty On Oil Filler Cap Against Defects In...
    09-072011
    SKU:
    09-072011
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $34.66
    Qty in Cart: 0
    Price:
    $34.66
    Subtotal:
  • 304 SS Bolt-Mount Hood Extensions W/ Louvers For International 9900ix 1999-2011

    304 SS Bolt-Mount Hood Extensions W/ Louvers For International 9900ix 1999-2011

    ROADWORKS

    $257.99
    RoadWorks 304 Stainless Steel Bolt-Mount Hood Extensions W/ Louvers* High Quality Hood Extensions* Made Of 304 Stainless Steel * With Louvers* Bolt Mount * Sold As Pair* Warranty On Hood Extensions...
    07-123000011
    SKU:
    07-123000011
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    International
    Finish Options:
    Polished
    Product Type:
    Hood Parts & Acc.
    $257.99
    Qty in Cart: 0
    Price:
    $257.99
    Subtotal:
  • Texas Chrome Bumper, 10 Gauge W/ Boxed Ends & Mounting Plates By BESTfit For Peterbilt 357/378 SFA & 379

    Texas Chrome Bumper, 10 Gauge W/ Boxed Ends & Mounting Plates By BESTfit For Peterbilt 357/378 SFA & 379

    BESTFIT TRUCK PARTS

    $759.99 - $868.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 357 1987 thru 2007* Fits Peterbilt 378 1988 thru 2007** Fits Above SBA Models Only* Fits Peterbilt 379 1987 thru 2007BESTfit 18 Inch Chrome...
    PPR_301150
    SKU:
    PPR_301150
    Finish Options:
    Chrome-Plated
    Product Type:
    Bumpers
    Height Options:
    20 Inch
    Material Options:
    Steel
    Type Options:
    Blind Mount
    Style Options:
    Texas Boxed End
    Truck Class:
    Heavy Duty
    Height Options:
    18 Inch
    Size Options:
    10 Gauge
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    $759.99 - $868.99
    Qty in Cart: 0
    Price:
    $759.99 - $868.99
    Subtotal:
  • 6 Inch Low Profile Fuel Filter Wrench For Davco Models 382 & 84

    6 Inch Low Profile Fuel Filter Wrench For Davco Models 382 & 84

    AUTOMANN USA

    $29.22
    Low Profile Wrench For 6 Inch OD Fuel Filters* High Quality Wrench* 6 Inch* Low Profile Design For Better Clearance* Sold Individually* Warranty On Wrenches Against Defects In Workmanship & Material...
    09-21000116
    SKU:
    09-21000116
    Product Type:
    Tools
    Length Options:
    6 Inch
    Make:
    Universal Items
    $29.22
    Qty in Cart: 0
    Price:
    $29.22
    Subtotal:
  • FREE SHIPPING OVER $249
    55MM Diesel Particulate Filter Gasket, Clamp Kit - Replaces A0004902241, A6804910480 For Freightliner & Western Star

    55MM Diesel Particulate Filter Gasket, Clamp Kit - Replaces A0004902241, A6804910480 For Freightliner & Western Star

    DAYTON / DORMAN

    $167.99
    55MM Diesel Particulate Filter Gasket & Clamp Kit* High Quality Diesel Particulate Filter Gasket And Clamp Kit* Band Width: 55 Mm, 0.17 Mm* Clamping Type: Bolt* Material: Stainless Steel, Mbg-D*...
    29-080600011
    SKU:
    29-080600011
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Freightliner
    Product Type:
    Exhaust
    $167.99
    Qty in Cart: 0
    Price:
    $167.99
    Subtotal:
  • 11 Inch Stainless Steel Drop Visor For Kenworth T680 & T880 W/ Low Roof Day Cab Models

    11 Inch Stainless Steel Drop Visor For Kenworth T680 & T880 W/ Low Roof Day Cab Models

    TRUX ACCESSORIES

    $1,200.99
    11 Inch Stainless Steel Drop Visor Fits Kenworth T680 & T880 W/ Low Roof Day Cab ModelsAre you looking for a heavy-duty visor for your rig? 4 State Trucks offers this great looking stainless steel...
    02-0900100117
    SKU:
    02-0900100117
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Material Options:
    Stainless Steel
    Height Options:
    11 1/2 Inch
    Light Options:
    Without Lights
    Type Options:
    Blind Mount
    Product Type:
    Exterior
    Style Options:
    Drop
    $1,200.99
    Qty in Cart: 0
    Price:
    $1,200.99
    Subtotal:
  • Plastic Headlight Switch Housing, On/ Off Function W/ 11 Blade Terminal And Center Mounting Position For International

    Plastic Headlight Switch Housing, On/ Off Function W/ 11 Blade Terminal And Center Mounting Position For International

    DAYTON / DORMAN

    $284.99
    On/ Off Function Headlight Switch Housing W/ 11 Blade Terminal* High Quality Headlight Switch Housing* Plastic* Mounting Position- Center* Switch Mounting Type- Clip* Connector Gender- Female*...
    07-160600011
    SKU:
    07-160600011
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    International
    Product Type:
    Lighting
    $284.99
    Qty in Cart: 0
    Price:
    $284.99
    Subtotal:
  • P1 LED Marker And Clearance Light W/ Packard Plug

    P1 LED Marker And Clearance Light W/ Packard Plug

    PHOENIX DESIGN

    $17.78 - $20.39
    Choose Option(s) to see description.Fitment** Universal - Fits Multiple Makes & Models Of TrucksRed LED Red Lens P1 Light Kit W/ Packard Plug, Chrome Plastic BezelRed LED Red Lens P1 Light Kit W/...
    PPR_301130
    SKU:
    PPR_301130
    Location:
    Made In USA
    Truck Class:
    Universal
    Color:
    Amber
    Material Options:
    Plastic/Poly
    Finish Options:
    Chrome-Plated
    Color:
    Red
    Truck Class:
    Heavy Duty
    Product Type:
    Lighting
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $17.78 - $20.39
    Qty in Cart: 0
    Price:
    $17.78 - $20.39
    Subtotal:
  • 18 Inch Blind Mount Stainless Texas Boxed End Bumper, 10 Gauge W/ UST Mount Plates For Freightliner, Kenworth & Peterbilt

    18 Inch Blind Mount Stainless Texas Boxed End Bumper, 10 Gauge W/ UST Mount Plates For Freightliner, Kenworth & Peterbilt

    VALLEY CHROME PLATING

    $1,151.99
    Stainless Steel Boxed End Bumper W/ UST Mounts by Valley Chrome. Fits Freightliner, Peterbilt & KenworthIf you are in the market for a new or replacement bumper, look no further than this 10-gauge...
    GO000011SUST
    SKU:
    GO000011SUST
    Truck Class:
    Heavy Duty
    Height Options:
    18 Inch
    Style Options:
    Texas Boxed End
    Material Options:
    Stainless Steel
    Finish Options:
    Chrome-Plated
    Make:
    Kenworth
    Make:
    Peterbilt
    Make:
    Freightliner
    Type Options:
    Blind Mount
    Size Options:
    10 Gauge
    Product Type:
    Bumpers
    $1,151.99
    Qty in Cart: 0
    Price:
    $1,151.99
    Subtotal:
  • 11 Inch Stainless Steel Drop Visor For International 9100/92/93/94/9900 Series W/ Flat Windshield

    11 Inch Stainless Steel Drop Visor For International 9100/92/93/94/9900 Series W/ Flat Windshield

    TRUX ACCESSORIES

    $523.99
    11 Inch Stainless Steel Drop Visor Fits International 9100/92/93/94/9900 Series W/ Flat Windshield* High Quality Visor* Flat Windshields* Stainless Steel * 11 Inch* Drop Style* Sold Individually*...
    07-09003011
    SKU:
    07-09003011
    Material Options:
    Stainless Steel
    Product Type:
    Exterior
    Truck Class:
    Heavy Duty
    Height Options:
    11 Inch
    Make:
    International
    Cab Style:
    Flat Windshield
    Style Options:
    Drop
    $523.99
    Qty in Cart: 0
    Price:
    $523.99
    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:
  • 12 Gauge Customs 7 X 11 Inch Aluminum Mighty Wicked Visor For Kenworth T800 & W900 W/ Flat 2 PC Windshield

    12 Gauge Customs 7 X 11 Inch Aluminum Mighty Wicked Visor For Kenworth T800 & W900 W/ Flat 2 PC Windshield

    TWELVE GAUGE

    $441.99
    7 X 11 Inch Aluminum Mighty Wicked Visor By 12 Gauge Customs Fits Kenworth T800 & W900 W/ Flat 2 PC Windshield* High Quality Visor* Made Of Aluminum* Must Be Painted* Mighty Wicked Style* Fits Flat...
    02-0901103
    SKU:
    02-0901103
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Finish Options:
    Paintable
    Material Options:
    Aluminum
    Light Options:
    Without Lights
    Product Type:
    Exterior
    $441.99
    Qty in Cart: 0
    Price:
    $441.99
    Subtotal:
  • BESTfit Chrome Texas Bumper, 10 Gauge W/ Hand Formed Ends & Tow Hole For Peterbilt 357 & 378 SFA, & 379

    BESTfit Chrome Texas Bumper, 10 Gauge W/ Hand Formed Ends & Tow Hole For Peterbilt 357 & 378 SFA, & 379

    BESTFIT TRUCK PARTS

    $631.99 - $780.99
    Choose Option(s) to see description.Fitment* Fits Peterbilt 357 1987 thru 2007* Fits Peterbilt 378 1988 thru 2007** Fits SFA Models Above Only* Fits Peterbilt 379 1987 thru 2007BESTfit 18 Inch Chrome...
    PPR_301149
    SKU:
    PPR_301149
    Finish Options:
    Chrome-Plated
    Height Options:
    18 Inch
    Product Type:
    Bumpers
    Height Options:
    20 Inch
    Size Options:
    10 Gauge
    Truck Class:
    Heavy Duty
    Style Options:
    Texas Hand Formed
    Type Options:
    Standard Mount
    Material Options:
    Steel
    Style Options:
    Texas Square Hand Formed
    Make:
    Peterbilt
    Ready To Ship:
    Yes
    $631.99 - $780.99
    Qty in Cart: 0
    Price:
    $631.99 - $780.99
    Subtotal:
  • 12 Gauge Customs 8 X 11 Inch Aluminum Reverse Bowtie Visor For Kenworth T800 & W900 W/ 1 PC Flat Windshield

    12 Gauge Customs 8 X 11 Inch Aluminum Reverse Bowtie Visor For Kenworth T800 & W900 W/ 1 PC Flat Windshield

    TWELVE GAUGE

    $446.99
    8 X 11 Inch Aluminum Reverse Bowtie Visor By 12 Gauge Customs Fits Kenworth T800 & W900 W/ 1 PC Flat WindshieldKeep in the shade and the rain out of your way with this quality aluminum reverse bowtie...
    02-0901102
    SKU:
    02-0901102
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Finish Options:
    Paintable
    Material Options:
    Aluminum
    Light Options:
    Without Lights
    Product Type:
    Exterior
    $446.99
    Qty in Cart: 0
    Price:
    $446.99
    Subtotal:
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