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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
How to Choose the Right W990 Drop Visor(Post)The best Kenworth W990 drop visor depends on your design preference, mounting configuration, and windshield type or cab style (curved or flat). Buying a Custom W990 Truck Visor Online? If you're brow
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.
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
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
T880 Visor Ultimate Buyer's Guide(Post)There are countless Kenworth T880 visor options to choose from depending on the theme and style you’re going for. Here's a quick buyer's guide for Kenworth T880 aftermarket visors. Before you buy, con
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
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FREE SHIPPING OVER $249
BESTfit Turbo Pipe Replaces 04-17123-024 For Freightliner Century
BESTFIT TRUCK PARTS
$210.99Turbo Pipe By BESTfit Fits FreightlinerRestore turbo efficiency on your Freightliner Century with the BESTfit Turbo Pipe, replacing OEM 04-17123-024. Built from aluminized steel, this high-quality...03-08130240- SKU:
- 03-08130240
- Truck Class:
- Heavy Duty
- Diameter Options:
- 5 Inch
- Material Options:
- Steel
- Make:
- Freightliner
- Finish Options:
- Chrome-Plated
- Style Options:
- Elbow Multi-Bend
- Product Type:
- Exhaust
$210.99Qty in Cart: 0Price:$210.99Subtotal: -
FREE SHIPPING OVER $249
Chrome Air Filter Door For Peterbilt
UNITED PACIFIC
$32.20Air Filter Door Fits Peterbilt* High Quality Air Filter* Made Of Chrome Plated Plastic* Sold Individually* Warranty On Air Filter Against Defects In Workmanship & Material From Date Of...01-1504024- SKU:
- 01-1504024
- Truck Class:
- Heavy Duty
- Material Options:
- Plastic/Poly
- Make:
- Peterbilt
- Finish Options:
- Chrome-Plated
- Product Type:
- Interior
- Ready To Ship:
- Yes
$32.20Qty in Cart: 0Price:$32.20Subtotal: -
1-Piece Stainless Steel Diesel Particulate Filter Replaces 4965227 For Cummins ISB/PX6 Engines
GLOBAL EMISSIONS
$1,410.991-Piece Stainless Steel Diesel Particulate Filter Fits Cummins ISB & PX6 Engines* High Quality Diesel Particulate Filter* Made Of Stainless Steel * Exclusive 1-Piece Canister Design For Durability*...29-080600024- SKU:
- 29-080600024
- Truck Class:
- Heavy Duty
- Style Options:
- Cummins
- Material Options:
- Stainless Steel
- Make:
- Universal Items
- Product Type:
- Exhaust
$1,410.99Qty in Cart: 0Price:$1,410.99Subtotal: -
RigMaster Upper Radiator Hose 10 1/2 Inch For T4-6 Models W/ Caterpillar Or Perkins Engine
RIGMASTER
$16.0310 1/2 Inch Radiator Upper Hose - RP5-024Check out this quality 10.5 inch top radiator long hose at 4 State Trucks for T4-6 models with Caterpillar and Perkins engines! It's built to last and keep...RP5024- SKU:
- RP5024
- Truck Class:
- Universal
- Length Options:
- 10 1/2 Inch
- Material Options:
- Rubber
- Make:
- Universal Items
- Product Type:
- Engine Parts
$16.03Qty in Cart: 0Price:$16.03Subtotal: -
High Flow Performance Air Filter With Washable Element Media For Peterbilt & Kenworth
FLEET FILTERS
$444.99High Performance Air Filter Media Fits Peterbilt, KenworthYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable, high...29-071300024- SKU:
- 29-071300024
- Truck Class:
- Heavy Duty
- Make:
- Kenworth
- Make:
- Peterbilt
- Product Type:
- Engine Parts
$444.99Qty in Cart: 0Price:$444.99Subtotal: -
High Flow Performance Air Filter With Washable Element Media For Kenworth T800, Peterbilt 388 - Pair
FLEET FILTERS
$839.99High Performance Air Filter Media Fits Kenworth T800, Peterbilt 388 - PairYou never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime,...29-090500024- SKU:
- 29-090500024
- Truck Class:
- Heavy Duty
- Make:
- Kenworth
- Make:
- Peterbilt
- Product Type:
- Exterior
$839.99Qty in Cart: 0Price:$839.99Subtotal: -
FREE SHIPPING
BESTfit 4 Inch Stainless Steel Tank Strap W/ Satin Finish For Peterbilt W/ 26 Inch Diameter Tanks Replaces 11-04551-001
BESTFIT TRUCK PARTS
$249.994 Inch Satin Finish Stainless Steel Tank Strap By BESTfit Replaces 11-04551-001 Fits Peterbilt W/ 26 Inch Diameter TanksTank falling off your truck? Let 4 State Trucks help keep you and your truck...01-0601024- SKU:
- 01-0601024
- Truck Class:
- Heavy Duty
- Product Type:
- Fuel Tanks
- Material Options:
- Stainless Steel
- Make:
- Peterbilt
- Ready To Ship:
- Yes
- Diameter Options:
- 26 Inch
$249.99Qty in Cart: 0Price:$249.99Subtotal: -
FASS Extended Length Particulate Filter W/ 144 Micron Rating
FASS
$26.01Extended Length Particulate Filter W/ 144 Micron RatingEnhance fuel system protection with the FASS Extended Length Particulate Filter featuring a 144 micron filtration rating, designed for Titanium...09-07030024- SKU:
- 09-07030024
- Product Type:
- Engine Parts
- Make:
- Universal Items
$26.01Qty in Cart: 0Price:$26.01Subtotal: -
102 X 11 Inch Dunnage Racks for Step Deck and Flatbed Trailers
HEAVY DUTY RAMPS
$1,285.99Dunnage Racks Holds Up to 16 Properly Tied-Down 8 4x4'sStore your dunnage easily under your trailer with this sturdy aluminum rack. It fits up to 16 tied-down 8' 4x4s, freeing up space for more cargo...19-024007- SKU:
- 19-024007
- Length Options:
- 102 Inch
- Product Type:
- Trailer
- Height Options:
- 11 Inch
- Make:
- Universal Items
- Truck Class:
- Heavy Duty
- Material Options:
- Aluminum
$1,285.99Qty in Cart: 0Price:$1,285.99Subtotal: -
VC Stainless Steel DPF Filter Cover 3 Pieces W/ Permit Panel For Peterbilt 389/Glider
VALLEY CHROME PLATING
$1,084.993 Piece Stainless Steel DPF Filter Cover W/ Permit Panel By Valley Chrome Fits Peterbilt 389/GliderAdd a polished touch to your Peterbilt 389 with this 3 piece stainless steel replacement cover from...01-050246- SKU:
- 01-050246
- Truck Class:
- Heavy Duty
- Product Type:
- Frame & Chassis
- Material Options:
- Stainless Steel
- Make:
- Peterbilt
$1,084.99Qty in Cart: 0Price:$1,084.99Subtotal: -
Gladhand Universal Cast W/ Filter 1/2 Inch FPT - 1241010
AUTOMANN USA
$22.591/2 Inch Universal Glad Hand Replaces 12-41010, 101F, F56321, 035031, And 81-0001-CThe Universal Glad Hand keeps your service lines running smoothly without pressure or power loss. Its durable cast...09-05500024- SKU:
- 09-05500024
- Truck Class:
- Universal
- Material Options:
- Cast Iron
- Make:
- Universal Items
- Product Type:
- Air, Electrical, & Safety
$22.59Qty in Cart: 0Price:$22.59Subtotal: -
Threaded Bushing 0.875 OD X 1.75 Inch - 11/16 Inch-11 Thread For Chevrolet, GMC
AUTOMANN USA
$6.93Threaded Bushing Replaces 379647* High Quality Threaded Bushing* Dimensions: - 1.75 Inch Length - 0.875 Inch O.D.* Threads: 11/16 Inch-11* Sold Individually* Warranty On Threaded Bushings Against...12-05100024- SKU:
- 12-05100024
- Diameter Options:
- 7/8 Inch
- Truck Class:
- Heavy Duty
- Length Options:
- 1 3/4 Inch
- Material Options:
- Steel
- Make:
- GMC
- Make:
- Chevrolet
- Product Type:
- Frame & Chassis
$6.93Qty in Cart: 0Price:$6.93Subtotal: -
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 York Style 6 Inch Diameter 2 Groove AC Compressor Clutch Assembly - Replaces 024-25238
BESTFIT TRUCK PARTS
$160.99BESTfit 12V AC Clutch Assembly With 2 - 1/2 Inch Belts & Keyed Shaft* High Quality AC Clutch* 12 Volts* 2 Wats* 2 Groove* (2) 1/2 Inch Belt Type* 2 Wire Metripack Wire Type* Keyed Shaft* W/ Diode*...09-070000048- SKU:
- 09-070000048
- Truck Class:
- Heavy Duty
- Make:
- Universal Items
- Product Type:
- Engine Parts
$160.99Qty in Cart: 0Price:$160.99Subtotal: -
BESTfit Camshaft For Cummins N14 Celect Plus - Replaces 3411327, 4024849
BESTFIT TRUCK PARTS
$733.99BESTfit Camshaft For Cummins N14 Celect Plus* High Quality Camshaft* For Cummins N14 Celect Plus* Sold Individually* Warranty On Camshafts Against Defects In Workmanship & Material From Date Of...29-074024849- SKU:
- 29-074024849
- Truck Class:
- Heavy Duty
- Product Type:
- Engine Parts
$733.99Qty in Cart: 0Price:$733.99Subtotal: -
FREE SHIPPING OVER $249
TCS9000 Trailer Brake Valve With Handle - Replaces K024943
OPP - ORIGINAL PARTS PROGRAM
$195.99Trailer Brake Valve & Handle* High Quality Brake Valve* For Trailer Break* With Handle * Sold Individually * Warranty On Brake Valve Against Defects In Workmanship & Material From Date Of Purchase*...K024943- SKU:
- K024943
- Truck Class:
- Heavy Duty
- Product Type:
- Air, Electrical, & Safety
$195.99Qty in Cart: 0Price:$195.99Subtotal: -
BESTfit York Style 6 Inch Diameter 2 Groove AC Compressor Clutch Assembly - Replaces 501939, 14192, 024-21590
BESTFIT TRUCK PARTS
$125.99BESTfit 12V AC Clutch Assembly With 2 - 1/2 Inch Belts & Keyed Shaft* High Quality AC Clutch* 12 Volts* 2 Groove* (2) 1/2 Inch Belt Type* 1 Wire Weatherpak Wire Type* Keyed Shaft* W/ Diode* Sold...09-070000047- SKU:
- 09-070000047
- Truck Class:
- Heavy Duty
- Make:
- Universal Items
- Product Type:
- Engine Parts
$125.99Qty in Cart: 0Price:$125.99Subtotal: -
Single Electric Horn Replaces 06-52125-024, 66-01788-002, 66-01788-003 For Western Star 5700XE
OPP - ORIGINAL PARTS PROGRAM
$29.96Replacement Electric Horn For Western Star 5700XE* High Quality Horn* Electric* Single * Direct OE Replacement Part* Sold Individually* Warranty On Horn Against Defects In Workmanship & Material From...14-0513000OE- SKU:
- 14-0513000OE
- Truck Class:
- Heavy Duty
- Make:
- Western Star
- OEM:
- OEM
- Style Options:
- 1 Bell
- Product Type:
- Exterior
$29.96Qty in Cart: 0Price:$29.96Subtotal: -
Replacement Alumzd Steel Exhaust Y-Pipe Replaces A04-16885-024 For Freightliner Classic XL/120 & FLD120
AFTERMARKET
$290.99Exhaust Y Pipe W/ 5 Inch OD Inlet & 5 Inch ID OutletsThis high quality 5 inch exhaust y-pipe that fits Freightliner Classic and FLD models will require an extension pipe to the BOM elbow if it used...03-0806001- SKU:
- 03-0806001
- Diameter Options:
- 5 Inch
- Truck Class:
- Heavy Duty
- Material Options:
- Steel
- Make:
- Freightliner
- Finish Options:
- Chrome-Plated
- Style Options:
- T-Pipe
- Product Type:
- Exhaust
- Ready To Ship:
- Yes
$290.99Qty in Cart: 0Price:$290.99Subtotal: -
Torque Rod Bracket 4.375 Replaces D2Hz5883A For Peterbilt
AUTOMANN USA
$32.60T Rod Bracket With 0.812 Inch Holes At 4.375 Inch Replaces D2HZ5883AUpgrade your truck suspension with the 4.375-inch Torque Rod Bracket, part number D2HZ5883A, designed to offer superior support and...01-05100024- SKU:
- 01-05100024
- Material Options:
- Steel
- Truck Class:
- Heavy Duty
- Make:
- Peterbilt
- Product Type:
- Frame & Chassis
$32.60Qty in Cart: 0Price:$32.60Subtotal: