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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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    5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-012 For Freightliner FLD

    5 Inch Aluminized Multi-Bend Turbo Pipe Replaces 04-17094-012 For Freightliner FLD

    AFTERMARKET

    $124.99
    Multi-Bend 5 Inch Aluminized Turbo Pipe Without Pyrometer Fitting Fits Freightliner FLD* High Quality Multi-Bend Turbo Pipe* Made Of Aluminized Steel* Multi-Bend Turbo Pipe For Freightliner* 5 Inch...
    03-08140120
    SKU:
    03-08140120
    Material Options:
    Steel
    Finish Options:
    Chrome-Plated
    Truck Class:
    Heavy Duty
    Product Type:
    Exhaust
    Make:
    Freightliner
    $124.99
    Qty in Cart: 0
    Price:
    $124.99
    Subtotal:
  • High Flow Performance Air Filter With Washable Element Media For Freightliner, International & Ford

    High Flow Performance Air Filter With Washable Element Media For Freightliner, International & Ford

    FLEET FILTERS

    $443.99
    High Flow Performance Air Filter With Washable Element Media Fits Freightliner, InternationalYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the...
    29-071300012
    SKU:
    29-071300012
    Truck Class:
    Heavy Duty
    Make:
    Sterling
    Product Type:
    Engine Parts
    $443.99
    Qty in Cart: 0
    Price:
    $443.99
    Subtotal:
  • Aluminized Steel Exhaust Elbow Replaces 04-17094-012 For Freightliner

    Aluminized Steel Exhaust Elbow Replaces 04-17094-012 For Freightliner

    UNITED PACIFIC

    $131.99
    Aluminized Exhaust ElbowThis aluminized steel exhaust elbow for excellent rust resistance replaces. Made for specific Freightliner models, it replaces part number 17094-012. Shop 4 State Trucks for...
    03-08070003
    SKU:
    03-08070003
    Material Options:
    Aluminized Steel
    Truck Class:
    Heavy Duty
    Style Options:
    Elbow Multi-Bend
    Make:
    Freightliner
    Product Type:
    Exhaust
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
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  • FASS Fuel Filter Housing Delete For Cummins 6.7L Engine 2010-2018

    FASS Fuel Filter Housing Delete For Cummins 6.7L Engine 2010-2018

    FASS

    $63.99
    Fuel Filter Housing DeleteStreamline your diesel fuel system with the FASS Fuel Filter Housing Delete for 2010-2018 Ram 6.7L Cummins engines. This high-quality delete kit is engineered to remove the...
    29-070300012
    SKU:
    29-070300012
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $63.99
    Qty in Cart: 0
    Price:
    $63.99
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  • FASS Spin- On Water Separator Fuel Filter For FASS Drop- In Series Fuel System

    FASS Spin- On Water Separator Fuel Filter For FASS Drop- In Series Fuel System

    FASS

    $35.19
    Spin- On Water Separator Fuel Filter Use With FASS Drop- In Series Fuel SystemsEnsure cleaner fuel and better engine protection with the FASS Spin-On Water Separator Fuel Filter designed for FASS...
    09-07030012
    SKU:
    09-07030012
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $35.19
    Qty in Cart: 0
    Price:
    $35.19
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  • Stainless Steel Passenger Side Exhaust Filter For Peterbilt 300 Series

    Stainless Steel Passenger Side Exhaust Filter For Peterbilt 300 Series

    PHOENIX DESIGN

    $341.99
    Passenger Side Exhaust Filter* High Quality Exhaust Filter* Cab/Cowl 1 Piece (Bodyline)* Stainless Steel* Passenger Side* Sold Individually* Warranty On Exhaust Filters Against Defects In Workmanship...
    01-0912012331
    SKU:
    01-0912012331
    Product Type:
    Exhaust
    Position:
    Passenger Side
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    $341.99
    Qty in Cart: 0
    Price:
    $341.99
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    BLEMISHED: Stainless Steel DPF Filter Cover For Peterbilt 389

    BLEMISHED: Stainless Steel DPF Filter Cover For Peterbilt 389

    4 STATE TRUCKS

    $879.99
    Peterbilt 389 SS DPF Filter CoverNormally $1,573.99 Plus Shipping, Buy This One Now For $1,145.00 with Free Shipping! You Save $425+ Plus Shipping Cost!***MINOR SURFACE SCRATCHES-BLEMISHED...
    ZB10001249
    SKU:
    ZB10001249
    Product Type:
    Exhaust
    $879.99
    Qty in Cart: 0
    Price:
    $879.99
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    BESTfit Cabin Air Filter 14 X 6 Inch For Mack CV, CX & CH Replaces 82745222

    BESTfit Cabin Air Filter 14 X 6 Inch For Mack CV, CX & CH Replaces 82745222

    BESTFIT TRUCK PARTS

    $23.99
    14 X 6 Inch Cabin Air Filter By BESTfit Fits Mack CV, CX & CH Replaces 82745222Improve cab air quality and HVAC performance with the BESTfit Cabin Air Filter for Mack CV, CX, and CH trucks, designed...
    11-150300012
    SKU:
    11-150300012
    Product Type:
    Interior
    Width Options:
    1 Inch
    Length Options:
    14 Inch
    Height Options:
    6 Inch
    Make:
    Mack
    $23.99
    Qty in Cart: 0
    Price:
    $23.99
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  • BESTfit 6.25 X 12.375 X 1.25 Inch Paper Cabin Air Filter Replaces 3839141-C1 For International

    BESTfit 6.25 X 12.375 X 1.25 Inch Paper Cabin Air Filter Replaces 3839141-C1 For International

    BESTFIT TRUCK PARTS

    $14.99
    BESTfit Paper Cabin Air Filter Fits International* High Quality Cabin Air Filter* Length: 12-3/8 Inch * Height: 6-1/4 Inch * Thickness: 1-1/4 Inch * Sold Individually* Warranty On Cabin Air Filter...
    07-150300012
    SKU:
    07-150300012
    Truck Class:
    Heavy Duty
    Length Options:
    12 Inch
    Make:
    International
    Product Type:
    Interior
    $14.99
    Qty in Cart: 0
    Price:
    $14.99
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    Dock Bumper Rubber 3 X 6 X 3 Inch Dock Bumper

    Dock Bumper Rubber 3 X 6 X 3 Inch Dock Bumper

    AUTOMANN USA

    $12.71
    Dock Bumper- 3 X 6 X 3 Inch Replaces B5500, 31497, 43445Safeguard your loading areas with the Rubber 3 X 6 X 3 Inch Dock Bumper, designed to absorb impact and prevent costly damage. Constructed from...
    09-012500
    SKU:
    09-012500
    Truck Class:
    Universal
    Make:
    Universal Items
    Ready To Ship:
    Yes
    Height Options:
    3 Inch
    Product Type:
    Bumpers
    Length Options:
    3 1/2 Inch
    Width Options:
    6 Inch
    Material Options:
    Rubber
    $12.71
    Qty in Cart: 0
    Price:
    $12.71
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    Carrier Bearing Kit With Bracket Replaces 210121-1X CB2101211XSA

    Carrier Bearing Kit With Bracket Replaces 210121-1X CB2101211XSA

    OPP - ORIGINAL PARTS PROGRAM

    $108.99
    Carrier Bearing Kit* High Quality Carrier Bearing Kit* 17N Series With Bracket* Sold As Kit* Warranty On Hub Adapter Against Defects In Workmanship & Material From Date Of Purchase*|** This Is An OEM...
    CB2101211XSA
    SKU:
    CB2101211XSA
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $108.99
    Qty in Cart: 0
    Price:
    $108.99
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  • 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
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  • Drag Link 21 Inch C To C - 1417547000 For Freightliner MT55

    Drag Link 21 Inch C To C - 1417547000 For Freightliner MT55

    AFTERMARKET

    $220.99
    21 Inch C To C Drag Link Replaces 1417547000, 14-17547-000* High Quality Drag Link* 21.00 Inch C To C* E To E- 14.50 Inch* Taper Pin Minor Diameter 1- 0.97 Inch* Taper Pin Major Diameter 1- 1.102...
    03-05090012
    SKU:
    03-05090012
    Truck Class:
    Heavy Duty
    Length Options:
    14 1/2 Inch
    Material Options:
    Steel
    Make:
    Freightliner
    Product Type:
    Frame & Chassis
    $220.99
    Qty in Cart: 0
    Price:
    $220.99
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  • Drag Link 28.375 Inch C To C Replaces L24VU8006A11 For Kenworth T600

    Drag Link 28.375 Inch C To C Replaces L24VU8006A11 For Kenworth T600

    AFTERMARKET

    $274.99
    28.375 Inch C To C Drag Link Replaces L24VU8006A11, L24VU8006B11Restore accurate steering response on your Kenworth T600 with the 28.375-inch C to C Drag Link. With shaft diameter of 1.44 inches,...
    02-05090012
    SKU:
    02-05090012
    Length Options:
    28 Inch
    Material Options:
    Steel
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    $274.99
    Qty in Cart: 0
    Price:
    $274.99
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  • Door-Mounted Name Plate Replaces A22-68830-012, A22-68830-014 For Western Star 5700XE 2018-Current

    Door-Mounted Name Plate Replaces A22-68830-012, A22-68830-014 For Western Star 5700XE 2018-Current

    OPP - ORIGINAL PARTS PROGRAM

    $48.85
    Name Plate For Western Star 5700XE* High Quality Name Plate* Door Mounted * Sold Individually * Warranty On Name Plate Against Defects In Workmanship & Material From Date Of Purchase* Replaces OE...
    14-0914001OE
    SKU:
    14-0914001OE
    Truck Class:
    Heavy Duty
    Make:
    Western Star
    OEM:
    OEM
    Product Type:
    Exterior
    $48.85
    Qty in Cart: 0
    Price:
    $48.85
    Subtotal:
  • BESTfit 6.625 X 12.0625 X 2.625 Inch AC Evaporator Replaces 3670125-C91, 3670132-C1 For International

    BESTfit 6.625 X 12.0625 X 2.625 Inch AC Evaporator Replaces 3670125-C91, 3670132-C1 For International

    BESTFIT TRUCK PARTS

    $240.99
    BESTfit AC Evaporator With Expansion Block Fits International 4000, 7000, 8000, LoneStar & ProStar* High Quality AC Evaporator* Height: 6 5/8 Inch* Length: 12 1/16 Inch* Inlet: #8 Bead Into Txv*...
    07-070000012
    SKU:
    07-070000012
    Truck Class:
    Heavy Duty
    Make:
    International
    Product Type:
    Engine Parts
    $240.99
    Qty in Cart: 0
    Price:
    $240.99
    Subtotal:
  • BESTfit Charge Air Cooler 28.69 X 26.41 X 2.21 Inch Replaces 1E3385, 1E3470 For Kenworth T600, T800, W900 1988-2007

    BESTfit Charge Air Cooler 28.69 X 26.41 X 2.21 Inch Replaces 1E3385, 1E3470 For Kenworth T600, T800, W900 1988-2007

    BESTFIT TRUCK PARTS

    $879.99
    Tube & Fin Charge Air Cooler 4 Inch Inlet & Outlet By BESTfit Replaces 1E3385, 1E3470* High Quality CAC Tube * Construction: Brazed* Core Size:   - 28.69 Height  - 26.41 Width  - 2.21 Depth * 4.00...
    02-070123
    SKU:
    02-070123
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $879.99
    Qty in Cart: 0
    Price:
    $879.99
    Subtotal:
  • Large A/C Vent Cover For Kenworth W900

    Large A/C Vent Cover For Kenworth W900

    GRAND GENERAL

    $3.50
    Large A/C Vent Cover* High Quality A/C Vent Cover* Chrome-Plated Plastic* Sold Individually* Warranty On A/C Vent Covers Against Defects In Workmanship & Material From Date Of Purchase*** High...
    02-16020012
    SKU:
    02-16020012
    Product Type:
    Interior
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    $3.50
    Qty in Cart: 0
    Price:
    $3.50
    Subtotal:
  • BESTfit Fuel Sender Replaces A22-68359-012 For Freightliner M2 With 18 Inch Rectangular Tank

    BESTfit Fuel Sender Replaces A22-68359-012 For Freightliner M2 With 18 Inch Rectangular Tank

    BESTFIT TRUCK PARTS

    $81.99
    Fuel Sender By BESTfit Fits Freightliner M2 With 18 Inch Rectangular Tank* High Quality Fuel Level Sender* For Trucks With 18 Inch Tall Rectangular Fuel Tanks* Restore Proper Fuel Gauge Readings With...
    03-060317
    SKU:
    03-060317
    Truck Class:
    Heavy Duty
    Shape Options:
    Rectangular
    Make:
    Freightliner
    Product Type:
    Fuel Tanks
    $81.99
    Qty in Cart: 0
    Price:
    $81.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Stainless Steel AC Heater Plate For Peterbilt

    Stainless Steel AC Heater Plate For Peterbilt

    UNITED PACIFIC

    $29.18
    A/C Control Plate Fits Peterbilt* High Quality Control Plate* Made Of High Quality Stainless Steel* For Older Models * Sold Individually* Warranty On Control Plate Against Defects In Workmanship &...
    01-1503012
    SKU:
    01-1503012
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Peterbilt
    Product Type:
    Interior
    $29.18
    Qty in Cart: 0
    Price:
    $29.18
    Subtotal:
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