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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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BESTfit Charge Air Cooler 43.11 X 18.4 X 1.6 Inch Replaces 15752110, 15843438 For GMC TopKick & Chevrolet Kodiak 2007-2009
BESTFIT TRUCK PARTS
$1,202.99Brazed Charge Air Cooler W/ 3 Inch Inlet & Outlet By BESTfit Replaces 15752110, 15843438Maintain peak performance in your GMC TopKick or Chevrolet Kodiak with the BESTfit 43.11 x 18.40 x 1.6 Inch...12-070110- SKU:
- 12-070110
- Truck Class:
- Heavy Duty
- Make:
- Mack
- Product Type:
- Engine Parts
$1,202.99Qty in Cart: 0Price:$1,202.99Subtotal: -
110 Drawbar Eye W/ 12 Inch Pushrod
PREMIER
$415.99Weld-On Slack Reducing Drawbar Eye For Use W/ 2.5 Inch Round Tubing* High Quality Weld-On Slack Reducing Eye* Includes: - Shoe - Drawbar Eye - 12 Inch Pushrod* Inside Diameter 2-3/8 Inch* Designed...09-051100768- SKU:
- 09-051100768
- Rating:
- 100000 LBS
- Truck Class:
- Universal
- Material Options:
- Steel
- Make:
- Universal Items
- Product Type:
- Frame & Chassis
$415.99Qty in Cart: 0Price:$415.99Subtotal: -
110 Drawbar Eye W/ 8 Inch Pushrod
PREMIER
$415.99Weld-On Slack Reducing Drawbar Eye For Use W/ 2.5 Inch Round Tubing* High Quality Weld-On Slack Reducing Eye* Includes: - Shoe - Drawbar Eye - 8 Inch Pushrod* Inside Diameter 2-3/8 Inch* Designed...09-051100767- SKU:
- 09-051100767
- Truck Class:
- Universal
- Rating:
- 100000 LBS
- Material Options:
- Steel
- Make:
- Universal Items
- Product Type:
- Frame & Chassis
$415.99Qty in Cart: 0Price:$415.99Subtotal: -
110 Drawbar Eye W/ 7 Inch Pushrod
PREMIER
$428.99Weld-On Slack Reducing Drawbar Eye For Use W/ 2.5 Inch Round Tubing* High Quality Weld-On Slack Reducing Eye* Includes: - Shoe - Drawbar Eye - 7 Inch Pushrod* Inside Diameter 2-3/8 Inch* Designed...09-051100766- SKU:
- 09-051100766
- Rating:
- 100000 LBS
- Truck Class:
- Universal
- Material Options:
- Steel
- Make:
- Universal Items
- Product Type:
- Frame & Chassis
$428.99Qty in Cart: 0Price:$428.99Subtotal: -
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: -
BESTfit Aluminum Fuel Tank 110 Gallon- 26 X 53 Inch- Center Fill W/ Early Style Manifold For Peterbilt 119 BBC & 127 BBC
BESTFIT TRUCK PARTS
$999.99110 Gallon- 26 X 53 Inch Aluminum Fuel Tank- Center Fill W/ Early Style Manifold By BESTfit Fits Peterbilt 119 BBC & 127 BBCThis BESTfit Fuel Tank Is Manufactured To Oe Specifications With The Same...01-060011003- SKU:
- 01-060011003
- Material Options:
- Aluminum
- Truck Class:
- Heavy Duty
- Length Options:
- 48 Inch
- Shape Options:
- Cylindrical
- Product Type:
- Fuel Tanks
- Diameter Options:
- 26 Inch
- Capacity:
- 110 Gallons
- Position:
- Center Fill
- Make:
- Peterbilt
- Size Options:
- 11 Gauge
- Type Options:
- Center Fill
- Ready To Ship:
- Yes
$999.99Qty in Cart: 0Price:$999.99Subtotal: -
FREE SHIPPING OVER $249
Trailer Air Valve Spring Brake Control Replaces RSL110500
AUTOMANN USA
$48.49Air Valve Spring Brake ControlMaintain precise trailer braking with the Trailer Air Valve Spring Brake Control. This high-quality air valve features dual 3/8-inch NPT delivery ports, a 3/8-inch NPT...110500- SKU:
- 110500
- Truck Class:
- Heavy Duty
- Make:
- Universal Items
- Product Type:
- Air, Electrical, & Safety
$48.49Qty in Cart: 0Price:$48.49Subtotal: -
Bimetal King Pin Bushing 1.91 ID, 2.05 OD, 2.5 Inch Replaces 5351110
AUTOMANN USA
$24.16King Pin Bushing Replaces 5351110Protect your steering system with this Bimetal King Pin Bushing, replacing OEM part 5351110. Crafted from bimetal with a 1.91-inch ID, 2.05-inch OD, and 2.5-inch...29-05110202- SKU:
- 29-05110202
- Material Options:
- Steel
- Diameter Options:
- 2 Inch
- Truck Class:
- Universal
- Make:
- Universal Items
- Product Type:
- Frame & Chassis
$24.16Qty in Cart: 0Price:$24.16Subtotal: -
FREE SHIPPING
EGR Cooler Replaces 85110346 For Volvo VHD, VNL & VNM With D12 Volvo Engine
DAYTON / DORMAN
$3,194.99EGR Cooler Fits Volvo VNL/VNM/VHD With Volvo D12 EngineKeep your Volvo VHD, VNL, or VNM diesel engine running clean and efficient with this stainless steel EGR Cooler, a direct OE replacement...13-0711001- SKU:
- 13-0711001
- Truck Class:
- Heavy Duty
- Make:
- Volvo
- Product Type:
- Engine Parts
$3,194.99Qty in Cart: 0Price:$3,194.99Subtotal: -
FREE SHIPPING
Ductile Iron Spring Hanger 8 Inch C To C Driver/Passenger Side For Peterbilt 379 Rear Air Leaf Suspension Replaces 03-44586M001, 01-21518
AUTOMANN USA
$415.99Driver/Passenger Side Ductile Iron Spring Hanger 8 Inch C To C Replaces 03-44586M001, 01-21518 Fits Peterbilt 379 Rear Air Leaf SuspensionThe Front Hanger replacement part is designed to provide...01-0509110- SKU:
- 01-0509110
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Product Type:
- Frame & Chassis
- Position:
- Front Of Rear
- Material Options:
- Steel
$415.99Qty in Cart: 0Price:$415.99Subtotal: -
66 Inch 304 Stainless Steel Long Front Half Fender W/ Rolled Edge
TRUX ACCESSORIES
$785.9923 X 24 X 66 Inch 14 Gauge Stainless Steel Standard Long Front Half FendersThis high quality 66 inch 304 14-gauge Stainless Steel Long Front Half Fender with a Rolled Edge is designed to fit 41 inch...09-11030229- SKU:
- 09-11030229
- Height Options:
- 23 Inch
- Truck Class:
- Universal
- Length Options:
- 66 Inch
- Width Options:
- 24 Inch
- Material Options:
- Stainless Steel
- Size Options:
- 14 Gauge
- Make:
- Universal Items
- Type Options:
- Half
- Finish Options:
- Polished
- Product Type:
- Rear Fenders
$785.99Qty in Cart: 0Price:$785.99Subtotal: -
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: -
On SaleLimited Quantity Available
Stainless Steel 27 X 24 Inch Quarter Fender Kit
TRUX ACCESSORIES
Now: $224.99Was: $249.9927 X 24 Inch Quarter Fender Kit Stainless SteelThe 27-inch quarter fenders in the 16-gauge stainless steel premium series come with triangle mounting Arms clamps, mudflaps, and hardware.* High...09-110306062- SKU:
- 09-110306062
- Product Type:
- Rear Fenders
- Truck Class:
- Heavy Duty
- Make:
- Universal Items
- Material Options:
- Stainless Steel
- Ready To Ship:
- Yes
Now: $224.99Was: $249.99Qty in Cart: 0Price:Now: $224.99Was: $249.99Subtotal: -
Turnpike Truck Trim Stainless Steel Exterior Windshield Trim For Peterbilt With 2 Piece Windshields (3 Piece Kit)
TURNPIKE TRUCK TRIM
$163.99Windshield Trim Wide On Bottom & Narrow On Top With No DimplesProtect your Peterbilt 2-piece windshield while enhancing style with the Turnpike Truck Trim Stainless Steel Exterior Windshield Trim...01-0911028- SKU:
- 01-0911028
- Truck Class:
- Heavy Duty
- Material Options:
- Stainless Steel
- Make:
- Peterbilt
- Product Type:
- Exterior
- Ready To Ship:
- Yes
$163.99Qty in Cart: 0Price:$163.99Subtotal: -
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: