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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
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.
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
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
7 Best Exterior Chrome Upgrades for the Kenworth W900A(Post)Outfit your Kenworth W900A model with stunning exterior chrome accessories and stainless-steel upgrades that seamlessly tie together the entire truck’s theme. Classic big rig owners take a lot of prid
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
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
Common Steering Problems on Peterbilt 379 Trucks(Post)Here are some of the most common steering problems found on older Peterbilt 379 models, how to diagnose those issues, and how to prevent them. Related Posts: How to Replace a Peterbilt Steering Shaf
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Oil Filter Spin On LF9025 For International 4300 W/ DT466
OPP - ORIGINAL PARTS PROGRAM
$69.99Spin On Oil Filter* High Quality Oil Filter* Overall Height 13.878 Inch (352.5 Mm)* Largest OD 4.65 Inch (118.11 Mm) * Seam OD 4.65 Inch (118.11 Mm) * Gasket OD 4.68 Inch (118.87 Mm)* Gasket Inside...LF9025FLG- SKU:
- LF9025FLG
- Truck Class:
- Heavy Duty
- Make:
- Universal Items
- Product Type:
- Engine Parts
$69.99Qty in Cart: 0Price:$69.99Subtotal: -
Heavy Duty Diesel Oxidation Catalyst Replaces 2888250NX For Cummins ISX 15.0L
DAYTON / DORMAN
$3,086.99Heavy Duty Diesel Oxidation CatalystRevitalize your Cummins ISX 15.0L's emissions system with the Heavy Duty Diesel Oxidation Catalyst, a replacement for OE number 2888250NX. This comprehensive kit...29-0809025- SKU:
- 29-0809025
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Make:
- Kenworth
- Product Type:
- Exhaust
$3,086.99Qty in Cart: 0Price:$3,086.99Subtotal: -
10.375 X 4 X 0.75 Inch Round U-Bolt
4 STATE TRUCKS
$54.9910.375 X 4 X 0.75 Inch U-BoltDepend on the 10.375 x 4 x 0.75 Inch Round U-Bolt for heavy-duty fastening with professional-grade strength. It includes a round bend, 3/4 inch - 16 threads, and...29-05090251- SKU:
- 29-05090251
- Product Type:
- Frame & Chassis
- Width Options:
- 4 Inch
- Diameter Options:
- 3/4 Inch
- Length Options:
- 10 1/4 Inch
- Make:
- Universal Items
$54.99Qty in Cart: 0Price:$54.99Subtotal: -
U-Bolt For Gen3 Air Ride Kit For Peterbilt 389 /Volvo VNL Gen III
TWELVE GAUGE
$33.00U-Bolt For Gen3 Air Ride Kit* High Quality U Bolt* Sold Individually* Warranty On U Bolts Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement Part...29-05090253- SKU:
- 29-05090253
- Product Type:
- Frame & Chassis
- Material Options:
- Steel
- Make:
- Peterbilt
- Make:
- Volvo
$33.00Qty in Cart: 0Price:$33.00Subtotal: -
Fitting Kit For Gen3 Air Ride For Peterbilt 389 /Volvo VNL Gen III
TWELVE GAUGE
$486.75Fitting Kit For Gen3 Air Ride* High Quality Fitting Kit* Sold As Kit* Warranty On Fitting Kits Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement...29-05090254- SKU:
- 29-05090254
- Product Type:
- Frame & Chassis
- Position:
- Kit Full
- Material Options:
- Brass
- Make:
- Peterbilt
- Make:
- Volvo
$486.75Qty in Cart: 0Price:$486.75Subtotal: -
On SaleLimited Quantity Available
14 Inch Chrome Wrap Around Break Back Bumper With Open Ends With Center Tow Pin Holes For Peterbilt 357/378 SBA
VALLEY CHROME PLATING
Now: $452.19Was: $645.99Valley Chrome Bumper With Wrap Around style* High Quality Bumper * Chrome-Plated Steel* 14 Inch Height* Has Cutouts For: - Mounting Holes - Center Tow Pin Holes* Wrap Around Style* With 19 Inch...HG009025- SKU:
- HG009025
- Height Options:
- 14 Inch
- Product Type:
- Bumpers
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Finish Options:
- Chrome-Plated
- Material Options:
- Steel
- Ready To Ship:
- Yes
Now: $452.19Was: $645.99Qty in Cart: 0Price:Now: $452.19Was: $645.99Subtotal: -
FREE SHIPPING OVER $249
40 LED Oval Turn Signal Light - Amber LED /Amber Lens
UNITED PACIFIC
$27.84Oval Led Light With 40 Led And Chrome Reflector* High Quality Turn Signal Light* Polycarbonate* 40 LED Oval * Amber LED/Amber Lens* Chrome Reflector * Sonically Sealed To Housing To Prevent Moisture...09-16090258- SKU:
- 09-16090258
- Color:
- Amber
- Truck Class:
- Universal
- Material Options:
- Plastic/Poly
- Shape Options:
- Oval
- Make:
- Universal Items
- Product Type:
- Lighting
$27.84Qty in Cart: 0Price:$27.84Subtotal: -
FREE SHIPPING OVER $249
39 LED Teardrop Stop. Turn And Tail Light W/Bezel - Red LED/ Red Lens
UNITED PACIFIC
$34.7539 LED Teardrop S/T/T Light With Chrome Bezel* High Quality Stop/Turn/Tail Light* Polycarbonate* 39 LED * Teardrop Shape* Red LED/Red Lens* With Chrome Bezel * Sonically Sealed To Housing To Prevent...09-16090259- SKU:
- 09-16090259
- Color:
- Red
- Truck Class:
- Universal
- Style Options:
- Teardrop
- Material Options:
- Plastic/Poly
- Make:
- Universal Items
- Finish Options:
- Chrome-Plated
- Product Type:
- Lighting
$34.75Qty in Cart: 0Price:$34.75Subtotal: -
1-1/2 Inch Front Leaf Spring Replaces B816065001
AUTOMANN USA
$698.991-1/2 Inch Front Leaf SpringRestore your truck's front suspension to peak condition with the 1-1/2 Inch Front Leaf Spring, a durable, high-quality replacement designed for heavy-duty use. Replacing...29-05090252- SKU:
- 29-05090252
- Product Type:
- Frame & Chassis
- Length Options:
- 1 1/2 Inch
- Make:
- Universal Items
$698.99Qty in Cart: 0Price:$698.99Subtotal: -
Steel Leaf Spring Suspension 27 Inch Axis 1 & 32 Inch Axis 2 Length
DAYTON / DORMAN
$1,514.99Steel Leaf Spring Suspension W/ 5 Leaves & 2 Threaded M32 X 4 Inch Diameter Bushing Pins* High Quality Leaf Spring Suspension* Made Of Steel* Full Taper Front Axle Type* Includes: - (2) Up Turned...29-05090259- SKU:
- 29-05090259
- Material Options:
- Steel
- Product Type:
- Frame & Chassis
- Location:
- Made In USA
- Make:
- Universal Items
$1,514.99Qty in Cart: 0Price:$1,514.99Subtotal: -
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: -
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: -
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
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
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
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: