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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
Top Semi Trucks Owned in Each State (Data for All 50 States) (Post)Here's some visual data on the most commonly owned heavy duty semi truck models based upon three popular truck brands: Peterbilt, Kenworth, and Freightliner. DISCLAIMER: (as of 2025) this data is four
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
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
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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: -
RigMaster APU Water Pump For Caterpillar, Perkins
RIGMASTER
$485.99OEM RigMaster Water Pump For Caterpillar & Perkins Engines* High Quality Water Pump* Sold Individually* Warranty On Water Pumps Against Defects In Workmanship & Material From Date Of Purchase*** High...145017380- SKU:
- 145017380
- Truck Class:
- Heavy Duty
- Material Options:
- Steel
- Make:
- Universal Items
- Product Type:
- Engine Parts
$485.99Qty in Cart: 0Price:$485.99Subtotal: -
Merritt Dyna-Light Aluminum Cab Rack 68 X 70 Inch W/ Tuck Away Tool Box 24 X 24 X 20 Inch
MERRITT
$2,471.99Aluminum Cab Rack W/ Radius Corners, Jail Bar Window, 2 Chain Racks & 2 Chain Trays* High Quality Cab Rack* Made Of Aluminum* 68 X 70 Inches* With Radius Corners* Jail Bar Window 25 Height X 22...317367K002- SKU:
- 317367K002
- Truck Class:
- Universal
- Material Options:
- Aluminum
- Product Type:
- Cargo Control
- Length Options:
- 68 Inch
- Width Options:
- 70 Inch
- Make:
- Universal Items
$2,471.99Qty in Cart: 0Price:$2,471.99Subtotal: -
Merritt Aluminum Cab Rack 68 X 70 Inch W/ 2 Chain Rack
MERRITT
$2,922.99Aluminum Cab Rack W/ Jail Bar Window, Radius Corners & Full Tray W/ Lid* High Quality Cab Rack* Made Of Aluminum * 68 Inch Height X 70 Inch Width * 2 Chain Rack * Full Tray With Lid * Jail Bar...317367C0059- SKU:
- 317367C0059
- Material Options:
- Aluminum
- Product Type:
- Cargo Control
- Finish Options:
- Diamond Plate
- Height Options:
- 68 Inch
- Truck Class:
- Heavy Duty
- Width Options:
- 70 Inch
- Make:
- Universal Items
$2,922.99Qty in Cart: 0Price:$2,922.99Subtotal: -
Merritt Aluminum Cab Rack 68 X 70 Inch W/ 1 Full Chain Tray & Full Lid
MERRITT
$2,349.99Aluminum Cab Rack W/ Jail Bar Window & Radius Corners* High Quality Cab Rack* Made Of Aluminum* 68 Inch Height * 70 Inch Width* With Radius Corners* Jail Bar Window - 25 Inch Height - 22 Inch...317367C0055- SKU:
- 317367C0055
- Finish Options:
- Diamond Plate
- Height Options:
- 68 Inch
- Material Options:
- Aluminum
- Truck Class:
- Universal
- Width Options:
- 70 Inch
- Product Type:
- Cargo Control
- Make:
- Universal Items
$2,349.99Qty in Cart: 0Price:$2,349.99Subtotal: -
Merritt 68 X 70 Inch Dyna-Light Aluminum Cab Rack
MERRITT
$2,705.99Aluminum Cab Rack W/ Center Enclosure & Radius Corners* High Quality Cab Rack* Made Of Aluminum * 68 Inch Height * 70 Inch Width* Center Enclosure* Merritt Dyna-Light * Radius Corners* Sold...317373- SKU:
- 317373
- Height Options:
- 68 Inch
- Finish Options:
- Diamond Plate
- Truck Class:
- Heavy Duty
- Material Options:
- Aluminum
- Product Type:
- Cargo Control
- Style Options:
- 1 Door
- Width Options:
- 70 Inch
- Make:
- Universal Items
$2,705.99Qty in Cart: 0Price:$2,705.99Subtotal: -
Merritt Dyna-Light Aluminum Cab Rack 68 X 70 Inch W/ Tuck Away Tool Box
MERRITT
$1,890.99Aluminum Cab Rack W/ Radius Corners & Jail Bar Window 25 X 22 Inch* High Quality Cab Rack* Made Of Aluminum* 68 X 70 Inches* With Radius Corners-Kit* Jail Bar Window 25 Height X 22 Width* Tuck Away...317367K001- SKU:
- 317367K001
- Length Options:
- 68 Inch
- Truck Class:
- Universal
- Width Options:
- 70 Inch
- Product Type:
- Cargo Control
- Material Options:
- Aluminum
- Make:
- Universal Items
$1,890.99Qty in Cart: 0Price:$1,890.99Subtotal: -
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: -
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: -
Stainless Steel Diesel Particulate Filter Replaces 2517331C91 For International W/ MaxxForce 7/DT Engine
GLOBAL EMISSIONS
$1,634.99Stainless Steel Diesel Particulate Filter Fits International W/ MaxxForce 7/DT Engines - Replaces 2517331C91* High Quality Diesel Particulate Filter* Made Of Stainless Steel * OEM Quality Clamps And...07-080600002- SKU:
- 07-080600002
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Make:
- International
- Product Type:
- Exhaust
$1,634.99Qty in Cart: 0Price:$1,634.99Subtotal: -
FREE SHIPPING
4 X 6 Inch Model 8800 Evolution 2 LED Headlights
AFTERMARKET
$437.99Heated Headlight W/ Chrome Bezel, Clear Outer Lens Color* High Quality Headlights* 4 X 6* 12-24V DOT/ECE LED High Beam* Heated With Chrome Bezel* Outer Lens Material- Hardcoated Polycarbonate* Outer...29-1606173- SKU:
- 29-1606173
- Lumens:
- 2001 to 4999 Lumens
- Color:
- Black
- Truck Class:
- Heavy Duty
- Material Options:
- Aluminum
- Make:
- Universal Items
- Product Type:
- Lighting
$437.99Qty in Cart: 0Price:$437.99Subtotal: -
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
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: -
3 Inch Stainless Steel Blank Standard/Wide Cowl Panels For Peterbilt 389 131BBC
PHOENIX DESIGN
$221.993 Inch Stainless Steel Blank Standard/Wide Cowl Panels Fit Peterbilt 389 131BBC* High Quality Cowl Panel* Made Of 304 Stainless Steel* Blank * Wide/Standard Cowl Panel * No Lights Or Light Holes* For...01-091201173- SKU:
- 01-091201173
- Truck Class:
- Heavy Duty
- Location:
- Made In USA
- Material Options:
- Stainless Steel
- Make:
- Peterbilt
- Finish Options:
- Polished
- Length Options:
- 27 Inch
- Light Options:
- Without Lights
- Product Type:
- Exterior
$221.99Qty in Cart: 0Price:$221.99Subtotal: -
FREE SHIPPING OVER $249
360 Degree 13 LED 1157 Type Bulb - Amber LED
UNITED PACIFIC
$10.24Double Contact Amber LED 1157 Type Bulb With Off Set Pin* High Quality Bulb* 13 LED* Amber* 360 Degree * 1157 Type* Double Contact* Off Set Pin* Sold Individually* Warranty On Bulbs Against Defects...09-16010173- SKU:
- 09-16010173
- Truck Class:
- Universal
- Color:
- Amber
- Make:
- Universal Items
- Product Type:
- Lighting
$10.24Qty in Cart: 0Price:$10.24Subtotal: