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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
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
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
Haul of Fame: Equipment Express's "Doc Holliday” A 2007 Peterbilt Legacy 379 Built to Legend(Post)Why "Doc Holliday" Earns a Spot in the Haul of Fame Every now and then, a truck rolls through that stops you dead in your tracks. "Doc Holliday," the custom 2007 Peterbilt Legacy 379 built by Equipmen
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FREE SHIPPING OVER $249
Ball Style Hood Latch Replaces K147-107 & K147-C-106 For Kenworth T300, T600, T800 & W900
BESTFIT TRUCK PARTS
$16.01Kenworth Ball Style Hood LatchAre you having trouble keeping your latch closed on your hood? 4 State Trucks has the quality aftermarket part that will get your hood back into working order. This ball...02-124001- SKU:
- 02-124001
- Truck Class:
- Heavy Duty
- Make:
- Kenworth
- Color:
- Black
- Material Options:
- Rubber
- Product Type:
- Hood Parts & Acc.
- Ready To Ship:
- Yes
$16.01Qty in Cart: 0Price:$16.01Subtotal: -
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Cartridge Kit For AD9 Air Dryer Replaces 107794, 107794X, 107796, 107797, 109756X, 1688515C91, 745107796, ADC2000, 1093795
AUTOMANN USA
$49.59Cartridge Kit Fits Air DryerReplace worn or old cartridges with this premium AD9 Air Dryer Cartridge Kit, designed to fit OEM numbers 107794, 107794X, 107796, 107797, 109756X, 1688515C91, 745107796,...107796- SKU:
- 107796
- Truck Class:
- Heavy Duty
- Make:
- Universal Items
- Product Type:
- Engine Parts
$49.59Qty in Cart: 0Price:$49.59Subtotal: -
BESTfit 5 Inch Exhaust Y-Pipe - Replaces 20457107 For Volvo VNL Gen II
BESTFIT TRUCK PARTS
$595.99BESTfit Steel Y Pipe For Volvo VNL Gen II 2004-2007Maintain optimal exhaust flow on your Volvo VNL Gen II with the BESTfit 5 Inch Exhaust Y-Pipe, a direct replacement for OE 20457107. Made from...13-080671070- SKU:
- 13-080671070
- Diameter Options:
- 5 Inch
- Truck Class:
- Heavy Duty
- Material Options:
- Steel
- Make:
- Volvo
- Finish Options:
- Chrome-Plated
- Product Type:
- Exhaust
$595.99Qty in Cart: 0Price:$595.99Subtotal: -
Intake Pre-Filter For LAF3551 Air Filter
FREEDOM AIR FILTERS
$76.99Intake 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
$76.99Qty in Cart: 0Price:$76.99Subtotal: -
20 Inch Stainless Steel Standard Tapered Boxed End Bumper, 10 Gauge W/ Tow Holes For Peterbilt 352 & 359
VALLEY CHROME PLATING
$1,379.99Valley Chrome Stainless Steel Standard Tapered Boxed End Bumper W/ Tow Holes Fits Peterbilt 352 & 359If you're in the market for a new or replacement bumper, look no further than this 10-gauge (1/8...HA0010742TS- SKU:
- HA0010742TS
- Material Options:
- Stainless Steel
- Truck Class:
- Heavy Duty
- Product Type:
- Bumpers
- Height Options:
- 20 Inch
- Type Options:
- Standard Mount
- Size Options:
- 10 Gauge
- Light Options:
- Without Lights
- Style Options:
- Standard Boxed End
- Make:
- Peterbilt
$1,379.99Qty in Cart: 0Price:$1,379.99Subtotal: -
20 Inch Stainless Steel Taper Box End Bumper W/ Tow/Hitch Holes For Peterbilt 357, 378, 379
VALLEY CHROME PLATING
$1,215.99Valley Chrome Taper Box End Bumper With Tow/ Hitch Holes* High Quality Bumper* Stainless Steel * 20 Inch* Taper Boxed End * Has Cutouts For Tow/Hitch Holes* Made In USA* Sold Individually* Warranty...HC001074S- SKU:
- HC001074S
- Truck Class:
- Heavy Duty
- Height Options:
- 20 Inch
- Location:
- Made In USA
- Material Options:
- Stainless Steel
- Make:
- Peterbilt
- Product Type:
- Bumpers
$1,215.99Qty in Cart: 0Price:$1,215.99Subtotal: -
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Rear Drive Axle Outer Wheel Bearing Set SET430, NP840302, NP053874
BESTFIT TRUCK PARTS
$69.99Wheel Bearing SET430 - NP840302 & NP053874* High Quality Wheel Bearing Set* For Rear Drive Axle Outer* Sold As Set* Set Contains: - 1 Tapered Wheel Bearing / Cone - 1 Wheel Bearing Race / Cup* 3...29-203107F- SKU:
- 29-203107F
- Truck Class:
- Heavy Duty
- Material Options:
- Steel
- Make:
- Universal Items
- Product Type:
- Wheels
- Position:
- Rear
$69.99Qty in Cart: 0Price:$69.99Subtotal: -
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Interior Fresh Air Filter For Peterbilt
CAB FRESH FILTER CO.
$22.07Peterbilt 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
$22.07Qty in Cart: 0Price:$22.07Subtotal: -
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Pre-Filter For Air Cleaner For Kenworth & Peterbilt
CAB FRESH FILTER CO.
$33.71Pre-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
$33.71Qty in Cart: 0Price:$33.71Subtotal: -
1-Piece Stainless Steel Diesel Particulate Filter Replaces A6804910794 For Detroit Diesel DD13/DD15 Engines
GLOBAL EMISSIONS
$2,845.991-Piece Stainless Steel Diesel Particulate Filter Fits Detroit Diesel DD13 & DD15 Engines* High Quality Diesel Particulate Filter* Made Of Stainless Steel * OEM Quality Clamps And Gaskets Included*...29-080600029- SKU:
- 29-080600029
- Truck Class:
- Heavy Duty
- Style Options:
- Detroit
- Material Options:
- Stainless Steel
- Make:
- Universal Items
- Product Type:
- Exhaust
$2,845.99Qty in Cart: 0Price:$2,845.99Subtotal: -
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Cab Fresh Filter Only For Freightliner Cascadia, Century, Columbia & Coronado
CAB FRESH FILTER CO.
$17.91Cab 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
$17.91Qty in Cart: 0Price:$17.91Subtotal: -
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Air Filter Assembly For HVAC For Peterbilt & Kenworth
CAB FRESH FILTER CO.
$38.75Air 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
$38.75Qty in Cart: 0Price:$38.75Subtotal: -
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Interior Fresh Air Filter Assembly For Peterbilt
CAB FRESH FILTER CO.
$46.91Peterbilt 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
$46.91Qty in Cart: 0Price:$46.91Subtotal: -
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Air Filter Assembly For HVAC No Housing For Peterbilt & Kenworth
CAB FRESH FILTER CO.
$14.27Air 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
$14.27Qty in Cart: 0Price:$14.27Subtotal: -
FREE SHIPPING OVER $249
Interior Cab Fresh Air Filter Replacement For Peterbilt 377, 378, 379 & 385
CAB FRESH FILTER CO.
$43.85Peterbilt 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
$43.85Qty in Cart: 0Price:$43.85Subtotal: -
FREE SHIPPING OVER $249
Black Plastic Cab Fresh Filter For Freightliner Cascadia, Century, Columbia & Coronado
CAB FRESH FILTER CO.
$51.99Cab Fresh Filter Fits FreightlinerReplace your original filter with this cab fresh filter with a charcoal spor-ax antimicrobial layer. This charcoal layer has adsorption properties that help capture...03-091305- SKU:
- 03-091305
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Material Options:
- Plastic/Poly
- Make:
- Freightliner
- Color:
- Black
- Product Type:
- Exterior
$51.99Qty in Cart: 0Price:$51.99Subtotal: -
FREE SHIPPING OVER $249
Cab Fresh Replacement HVAC Pre-Filter For Peterbilt & Kenworth
CAB FRESH FILTER CO.
$14.27Air Filter HVAC Pre-FilterKeep your HVAC system running clean and efficient with this replacement pre-filter designed to fit inside the existing housing assembly. It helps capture dust, debris, and...29-091301- SKU:
- 29-091301
- Location:
- Made In USA
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Make:
- Kenworth
- Ready To Ship:
- Yes
- Product Type:
- Interior
$14.27Qty in Cart: 0Price:$14.27Subtotal: -
Radiator Support Rod Replaces A05-30685-000 For Freightliner Cascadia 113/125 - Passenger Side
AFTERMARKET
$85.99Freightliner Passenger Side Radiator Support Rod Replaces A05-30685-000* High Quality Radiator Support Rod * Dimensions - 26.67 MM OD - 759.60 MM C to C* Passenger Side* Sold Individually* Warranty...03-0702107- SKU:
- 03-0702107
- Truck Class:
- Heavy Duty
- Material Options:
- Steel
- Make:
- Freightliner
- Product Type:
- Engine Parts
$85.99Qty in Cart: 0Price:$85.99Subtotal: -
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37 Diode Amber LED Turn Signal LED Light For Peterbilt 379, 378, 367, 365, 357
UNITED PACIFIC
$50.99 - $79.99Take your lighting up a notch with a 37 diode amber LED turn signal light designed for select Peterbilt models, including 357, 365, 367, 378, and 379 applications. This aftermarket LED assembly is...PPR_203107- SKU:
- PPR_203107
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Style Options:
- Factory Style
- Material Options:
- Plastic/Poly
- Product Type:
- Lighting
- Ready To Ship:
- Yes
$50.99 - $79.99Qty in Cart: 0Price:$50.99 - $79.99Subtotal: -
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Chrome AC Knob For Freightliner Century, Columbia, Coronado
UNITED PACIFIC
$9.26A/C Knob Fits Freightliner* High Quality Knob* Made Of Chrome Plated Plastic* Older Model* Sold Individually* Warranty On Knob Against Defects In Workmanship & Material From Date Of Purchase***High...03-1501074- SKU:
- 03-1501074
- Truck Class:
- Heavy Duty
- Make:
- Freightliner
- Product Type:
- Interior
$9.26Qty in Cart: 0Price:$9.26Subtotal: