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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
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
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
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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: -
FREE SHIPPING OVER $249
TPHD Chrome 5 Inch 68 Degree Elbow For Peterbilt 359
TPHD
$154.99Peterbilt 359 5 Inch Exhaust Elbow ChromeThe TPHD Chrome 5 Inch 68 Degree Elbow is engineered for Peterbilt 359 trucks, featuring a durable chrome-plated steel construction that resists corrosion and...01-08117264- SKU:
- 01-08117264
- Diameter Options:
- 5 Inch
- Truck Class:
- Heavy Duty
- Style Options:
- Elbow
- Material Options:
- Steel
- Make:
- Peterbilt
- Finish Options:
- Chrome-Plated
- Degree Options:
- 68
- Product Type:
- Exhaust
- Ready To Ship:
- Yes
$154.99Qty in Cart: 0Price:$154.99Subtotal: -
FREE SHIPPING OVER $249
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: -
Fuel Water Separator Cartridge Replaces PF46081, L5111F, K371011, K371029 For PACCAR
OPP - ORIGINAL PARTS PROGRAM
$74.99Fuel-Water Separator CartridgeThis fuel water separator cartridge is a reliable replacement for the Baldwin PF46081, Luber-Finer L5111F, and PACCAR models K371011 and K371029. This cartridge...FS20172FLG- SKU:
- FS20172FLG
- Truck Class:
- Heavy Duty
- Product Type:
- Engine Parts
$74.99Qty in Cart: 0Price:$74.99Subtotal: -
FREE SHIPPING OVER $249
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: -
FREE SHIPPING OVER $249
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: -
FREE SHIPPING OVER $249
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: -
FREE SHIPPING OVER $249
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: -
FREE SHIPPING OVER $249
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
Black & Red Rubber Mud Flap 24 X 30 Inch
AFTERMARKET
$73.9924 X 30 Inch Black And Red Mud FlapThis pair of black and red rubber mud flaps mount behind your tires to prevent small debris from flying up into the air caused by them rotating. Made by M&C Mud...09-0507172- SKU:
- 09-0507172
- Height Options:
- 30 Inch
- Truck Class:
- Universal
- Width Options:
- 24 Inch
- Material Options:
- Rubber
- Make:
- Universal Items
- Product Type:
- Mud Flaps
$73.99Qty in Cart: 0Price:$73.99Subtotal: -
FREE SHIPPING
4 X 6 Inch Chrome Model 8800 Evolution 2 LED Low Beam Headlight
AFTERMARKET
$437.99Low Beam Heated 4 X 6 Headlight With Chrome Bezel* High Quality Headlights* 4 Inch X 6 Inch* 12-24V DOT/ECE LED Low Beam* Heated With Chrome Bezel* Outer Lens Material- Hardcoated Polycarbonate*...29-1606172- SKU:
- 29-1606172
- Color:
- Black
- Truck Class:
- Heavy Duty
- Lumens:
- 2001 to 4999 Lumens
- Material Options:
- Aluminum
- Make:
- Universal Items
- Product Type:
- Lighting
$437.99Qty in Cart: 0Price:$437.99Subtotal: -
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: -
CSM Maroon Cab Carpet For Peterbilt 379 1988-2004
AUTO CUSTOM CARPETS
$458.99Maroon Cab Carpet Fits Peterbilt 379* High Quality Cab Carpet* Color: Maroon* Sold Individually * Warranty On Cab Carpets Against Defects In Workmanship & Material From Date Of Purchase*** High...01-151720- SKU:
- 01-151720
- Truck Class:
- Heavy Duty
- Color:
- Red
- Make:
- Peterbilt
- Product Type:
- Interior
$458.99Qty in Cart: 0Price:$458.99Subtotal: -
Ultra Rod Plus Tube End W/ Female End, 1-13/16in Shaft, 8-9/16in Center to End - E2639
AFTERMARKET
$80.99Ultra Rod Plus Tube End W/ 1-13/16 Inch Shaft, 8-9/16 Inch Center to End, Female End, Side A - Straddle - E2639* High Quality Rod Plus Tube End* Includes - (1) Ultra Rod Plus Tube End - (1) Torque...29-05100172- SKU:
- 29-05100172
- Length Options:
- 8 5/8 Inch
- Material Options:
- Steel
- Truck Class:
- Heavy Duty
- Product Type:
- Frame & Chassis
$80.99Qty in Cart: 0Price:$80.99Subtotal: -
21 Diode 3-1/4 Inch Dual Function Harley Signal Light W/ 1157 Plug - Amber LED / Clear Lens
UNITED PACIFIC
$26.583-1/4 Inch Dual Function Signal Light Fits Original Harley Davidson Housing* High Quality Signal Light* 3 1/4 Inch* 21 Diodes* Amber LED/Clear Lens * Wiring Code: - Red: High Function - Black: Low...09-1601011172- SKU:
- 09-1601011172
- Material Options:
- Plastic/Poly
- Diameter Options:
- 3 1/4 Inch
- Truck Class:
- Universal
- Make:
- Universal Items
- Product Type:
- Lighting
$26.58Qty in Cart: 0Price:$26.58Subtotal: -
Serpentine Belt Tensioner Pulley Assembly Replaces 49610, 1878397, 1929107
AFTERMARKET
$389.99Drive Belt Tensioner & Pulley Assembly* High Quality Tensioner Assembly* Dimensions: - 1.28 Inch Pulley Width - 2.958 Inch Pulley O.D.* Made In USA* Sold Individually* Warranty On Tensioners...29-07060172- SKU:
- 29-07060172
- Product Type:
- Engine Parts
- Truck Class:
- Heavy Duty
- Width Options:
- 1 1/4 Inch
- Make:
- Kenworth
- Make:
- Peterbilt
$389.99Qty in Cart: 0Price:$389.99Subtotal: -
Crewson Type Automatic Slack Adjuster 1.5 Inch X 10 Spline Replaces OE CB21102, CI21102 By BESTfit
BESTFIT TRUCK PARTS
$135.99BESTfit Slack Adjuster Crewson StyleThe Slack Adjuster features a 1.50-inch diameter and 10 spline configuration, making it a perfect fit for your vehicle's brake system. Designed in the reliable...09-0517205- SKU:
- 09-0517205
- Product Type:
- Frame & Chassis
- Make:
- Universal Items
$135.99Qty in Cart: 0Price:$135.99Subtotal: -
Oxblood OEM Style Rear Wall Panel For Peterbilt 379
SPARETIME FAB
$429.99Oxblood Rear Wall Panel- OEM StyleRestore your Peterbilt 379 cab to classic perfection with the Oxblood OEM Style Rear Wall Panel, tailored for day cabs with large back windows and American Classic...01-15230172- SKU:
- 01-15230172
- Product Type:
- Interior
- Color:
- Red
- Make:
- Peterbilt
$429.99Qty in Cart: 0Price:$429.99Subtotal: