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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
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
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
Blatant Signs Your Turbocharger is Failing (And When to Replace it) (Post)If your semi truck turbocharger is failing, you'll encounter a few common signs. In this post, we'll cover what those are, and similar symptoms that aren't actually the turbo, but a related part. Sig
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
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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FREE SHIPPING OVER $249
BESTfit 5 Inch Turbo Pipe Extension Elbow Replaces 14-13409 For Peterbilt 357, 378, 379
BESTFIT TRUCK PARTS
$69.99BESTfit Turbo Extension Pipe Fits PeterbiltFor trucks equipped with high-mount exhaust systems, the BESTfit 5 Inch Turbo Pipe Extension Elbow ensures your Peterbilt 357, 378, or 379 maintains optimal...01-08013409- SKU:
- 01-08013409
- Truck Class:
- Heavy Duty
- Diameter Options:
- 5 Inch
- Material Options:
- Aluminized Steel
- Degree Options:
- 20
- Make:
- Peterbilt
- Product Type:
- Exhaust
- Ready To Ship:
- Yes
$69.99Qty in Cart: 0Price:$69.99Subtotal: -
FREE SHIPPING OVER $249
BESTfit 5 Inch ID/OD 90 Degree Elbow Pipe Replaces 14-13433 For Peterbilt 379
BESTFIT TRUCK PARTS
$97.99BESTfit Lower Elbow Below Turbo Frame PipeFor Peterbilt 379 owners, the BESTfit 5 Inch ID/O.D. 90 Degree Elbow Pipe offers a replacement for OE number 14-13433. Sold individually, this elbow pipe is...01-08134330- SKU:
- 01-08134330
- Diameter Options:
- 5 Inch
- Truck Class:
- Heavy Duty
- Style Options:
- Elbow
- Material Options:
- Steel
- Degree Options:
- 90
- Make:
- Peterbilt
- Length Options:
- 12 Inch
- Finish Options:
- Galvanized
- Product Type:
- Exhaust
- Ready To Ship:
- Yes
$97.99Qty in Cart: 0Price:$97.99Subtotal: -
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BESTfit Alumzd Steel Replacement Pipe W/ 58 Degree Bend For Peterbilt 377, 378 & 379 Replaces 14-13430
BESTFIT TRUCK PARTS
$134.99Alumzd Steel Replacement Pipe W/ 5 Inch OD By BESTfit Replaces 14-13430 Fits Peterbilt 377, 378 & 379The BESTfit 5 Inch OD 58 Degree Turbo Elbow is designed to provide Peterbilt 377, 378, and 379...01-08134300- SKU:
- 01-08134300
- Diameter Options:
- 5 Inch
- Truck Class:
- Heavy Duty
- Degree Options:
- 58
- Make:
- Peterbilt
- Product Type:
- Exhaust
- Ready To Ship:
- Yes
- Location:
- Made In USA
- Material Options:
- Aluminized Steel
$134.99Qty in Cart: 0Price:$134.99Subtotal: -
Load Spring Replaces E9410, E-11496, 49377, 49377000, 49377-000, 60879, 60879000, 60879-000, 60879000L, 60879-000L, 400060879000L, 4000-60879000L, 1138983, 8HS640, 1348, 21921 For Hendrickson Suspension
AFTERMARKET
$213.995.625/ 6.875 X 5.25 Inch Load Spring W/ 0.438 Inch Bolt HoleEnsure your Hendrickson suspension operates at peak performance with this premium Load Spring. Top plate length 5.625 inches, bottom plate...29-05100134- SKU:
- 29-05100134
- Width Options:
- 6 5/8 Inch
- Product Type:
- Frame & Chassis
- Length Options:
- 5 5/8 Inch
- Height Options:
- 5 Inch
- Make:
- Universal Items
$213.99Qty in Cart: 0Price:$213.99Subtotal: -
BESTfit 5 Inch Plain Economy Exhaust Elbow BOM Passenger Side W/ Hi Mount Exhaust For Peterbilt 357, 378 & 379
BESTFIT TRUCK PARTS
$400.995 Inch Plain Economy Exhaust Elbow BOM Passenger Side W/ Hi Mount Exhaust By BESTfit Fits Peterbilt 357, 378 & 379For a cost-effective solution that doesn't sacrifice performance, choose the BESTfit...01-08134121- SKU:
- 01-08134121
- Diameter Options:
- 5 Inch
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Product Type:
- Exhaust
- Ready To Ship:
- Yes
- Material Options:
- Aluminized Steel
- Style Options:
- Elbow Multi-Bend
$400.99Qty in Cart: 0Price:$400.99Subtotal: -
85MM Front Shackle Side Bar For Peterbilt, Kenworth
AUTOMANN USA
$17.3485MM Leaf Spring Shackle Side Bar Replaces B20-6017Reinforce your Peterbilt or Kenworth suspension with the 85MM Front Shackle Side Bar. Engineered for front medium-duty axles with bushings, this...29-05090134- SKU:
- 29-05090134
- Truck Class:
- Heavy Duty
- Material Options:
- Steel
- Make:
- Peterbilt
- Make:
- Kenworth
- Product Type:
- Frame & Chassis
$17.34Qty in Cart: 0Price:$17.34Subtotal: -
BESTfit 5 Inch Plain Exhaust Elbow Replaces 14-15503 For Peterbilt 357 & 378 Passenger Side
BESTFIT TRUCK PARTS
$781.99BESTfit Exhaust Elbow Below Muffler Fits PeterbiltThis high quality 5 inch plain exhaust elbow fits Peterbilt passenger side. The elbow comes with a 1 year warranty.* High Quality Exhaust Elbow* 4...01-08134120- SKU:
- 01-08134120
- Diameter Options:
- 5 Inch
- Truck Class:
- Heavy Duty
- Style Options:
- Elbow Multi-Bend
- Material Options:
- Steel
- Make:
- Peterbilt
- Product Type:
- Exhaust
- Ready To Ship:
- Yes
$781.99Qty in Cart: 0Price:$781.99Subtotal: -
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 SBA Bumper W/ Mounting & Vent Holes For Kenworth T400 SBA
VALLEY CHROME PLATING
$1,641.99Valley Chrome 20 Inch SBA Bumper With Mounting & Vent Holes* High Quality Replacement Bumper* 20 Inch SBA* Has Cutouts For: - Mounting - Vent Holes* Does Not Include Lights, Mounting Bolts, Washers...FM000134- SKU:
- FM000134
- Truck Class:
- Heavy Duty
- Light Options:
- Without Lights
- Height Options:
- 20 Inch
- Make:
- Kenworth
- Style Options:
- Set Back Axle
- Material Options:
- Steel
- Finish Options:
- Chrome-Plated
- Type Options:
- Standard Mount
- Product Type:
- Bumpers
$1,641.99Qty in Cart: 0Price:$1,641.99Subtotal: -
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17 Inch 24 Diode Slim Flatline Amber LED Light W/ Clear Lens & Chrome Bezel
TRUX ACCESSORIES
$36.59Amber LED Slim Flatline Light W/ Clear Lens & Chrome Bezel4 State Trucks offers this quality 17-inch LED marker light with a sleek and shiny chrome bezel. Made to withstand outside elements, it has...09-1601011134- SKU:
- 09-1601011134
- Color:
- Amber
- Truck Class:
- Universal
- Length Options:
- 17 Inch
- Style Options:
- Flatline
- Shape Options:
- Oval
- Make:
- Universal Items
- Product Type:
- Lighting
- Ready To Ship:
- Yes
$36.59Qty in Cart: 0Price:$36.59Subtotal: -
20 Inch SS SBA Bumper With Vent Holes For Kenworth T400
VALLEY CHROME PLATING
$1,300.99Valley Chrome SBA Bumper With Vent Holes* High Quality Bumper* Stainless Steel* 20 Inch* Has Vent Holes* Set Back Axle* Made In USA* Sold Individually* Warranty On Bumpers Against Defects In...FM000134S- SKU:
- FM000134S
- Product Type:
- Bumpers
- Height Options:
- 20 Inch
- Truck Class:
- Heavy Duty
- Style Options:
- Set Back Axle
- Material Options:
- Stainless Steel
- Make:
- Kenworth
$1,300.99Qty in Cart: 0Price:$1,300.99Subtotal: -
20 Inch 17 Diode Spyder Front, Park, Turn Light Bar - Amber LED/ Clear Lens
GRAND GENERAL
$48.07Amber LED Front Park Turn Spyder Light Bar With Sealed Clear LensThe 20-inch Spyder LED light bar comes with amber-clear front park and turn light functions. It features a sealed polycarbonate lens,...09-160101340- SKU:
- 09-160101340
- Truck Class:
- Heavy Duty
- Length Options:
- 20 Inch
- Material Options:
- Plastic/Poly
- Color:
- Amber/Clear
- Make:
- Universal Items
- Product Type:
- Lighting
$48.07Qty in Cart: 0Price:$48.07Subtotal: -
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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: -
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
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: -
Roadworks 15.5 X 17.5 Inch Untie Drop Visor W/ 5 H1 Amber LED Lights For Kenworth T680 & T880
ROADWORKS
$1,067.9915.5 X 17.5 Inch Untie Drop Visor W/ 5 H1 Amber LED Lights By Roadworks Fits Kenworth T680 & T880* High Quality Untie Drop Visor* 17.5 To 15.5 Inch Inner * (5) H1 Hero LED Lights* Amber/Amber* Blind...02-0901340- SKU:
- 02-0901340
- Truck Class:
- Heavy Duty
- Location:
- Made In USA
- Light Options:
- With Lights
- Material Options:
- Stainless Steel
- Make:
- Kenworth
- Finish Options:
- Polished
- Type Options:
- Blind Mount
- Product Type:
- Exterior
- Style Options:
- Drop
$1,067.99Qty in Cart: 0Price:$1,067.99Subtotal: -
10 Inch Stainless Steel Bowtie Drop Visor W/ Standard Mount For Kenworth Curved Windshield
ROADWORKS
$453.99RoadWorks Standard Mount SS Bowtie Drop Visor* High Quality Visor* Standard Mount* Bowtie Visor* For Curved Windshield* 1 Piece With Cast Mirror Brackets* Sold Individually* Warranty On Visors...02-0901342- SKU:
- 02-0901342
- Truck Class:
- Heavy Duty
- Location:
- Made In USA
- Material Options:
- Stainless Steel
- Make:
- Kenworth
- Light Options:
- Without Lights
- Product Type:
- Exterior
- Cab Style:
- Curved Windshield
$453.99Qty in Cart: 0Price:$453.99Subtotal: -
12 Gauge Customs 10X7 Inch Stainless Steel Bowtie Visor For Kenworth T600, T800, W900B, W900 L W/ Flat Glass
TWELVE GAUGE
$509.9910X7 Inch Stainless Steel Bowtie Visor By 12 Gauge Customs Fits Kenworth T600, T800, W900B, W900 L W/ Flat Glass* High Quality Bowtie Visor* Made Of Polished Stainless Steel * 2 Piece * Side Mount *...02-0901343- SKU:
- 02-0901343
- Truck Class:
- Heavy Duty
- Height Options:
- 10 Inch
- Make:
- Kenworth
- Style Options:
- Bow Tie
- Material Options:
- Stainless Steel
- Finish Options:
- Polished
- Light Options:
- Without Lights
- Type Options:
- Standard Mount
- Product Type:
- Exterior
- Ready To Ship:
- Yes
$509.99Qty in Cart: 0Price:$509.99Subtotal: -
Twelve Gauge 9 Inch Stainless Steel Drop Visor For Kenworth T600 Aerocab, T660, T800, W900B And W900L Aerocab Models
TWELVE GAUGE
$448.999 Inch Stainless Steel Drop Visor By Twelve Gauge Fits Kenworth T600 Aerocab, T660, T800, W900B And W900L Aerocab ModelsAdd a sleek touch to your Kenworth truck with this stainless steel reverse...02-0901345- SKU:
- 02-0901345
- Truck Class:
- Heavy Duty
- Height Options:
- 13 Inch
- Make:
- Kenworth
- Material Options:
- Stainless Steel
- Light Options:
- Without Lights
- Type Options:
- Blind Mount
- Product Type:
- Exterior
- Style Options:
- Reverse Bowtie
- Ready To Ship:
- Yes
$448.99Qty in Cart: 0Price:$448.99Subtotal: