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Kenworth T300-T450 Parts

Shop heavy-duty mechanical replacement parts designed to fit the Kenworth T300 (1995 - 2007) and Kenworth T450 (1989 - 1997). Order precision-fit, quick-to-ship aftermarket truck parts to minimize downtime. Customize the look of your medium-duty vocational truck with our selection of exterior and interior chrome accessories, or outfit the frame rail with toolboxes, fuel tanks, and more.
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  • BESTfit Cummins DEF Doser Injector Replaces 5506855, A050S599, 4377650 For Cummins

    BESTfit Cummins DEF Doser Injector Replaces 5506855, A050S599, 4377650 For Cummins

    BESTFIT TRUCK PARTS

    $715.99
    Diesel Exhaust Fluid Doser Injector By BESTfit Replaces 5506855, A050S599, 4377650 Fits CumminsMaintain peak emissions system performance with the BESTfit Cummins DEF Doser Injector, a reliable...
    29-06070040
    SKU:
    29-06070040
    Product Type:
    Fuel Tanks
    Style Options:
    Cummins
    Make:
    Universal Items
    $715.99
    Qty in Cart: 0
    Price:
    $715.99
    Subtotal:
  • BESTfit Power Take-Off For Mechanical Transmissions Replaces 489XFAHXV3RA, 489XFAHXV3RB, 489XFAHXV3XK

    BESTfit Power Take-Off For Mechanical Transmissions Replaces 489XFAHXV3RA, 489XFAHXV3RB, 489XFAHXV3XK

    BESTFIT TRUCK PARTS

    $1,401.99
    Power Take- Off By BESTfit Replaces 489XFAHXV3RA, 489XFAHXV3RB, 489XFAHXV3XK Fits Mechanical TransmissionsBuilt for strength and reliability, the BESTfit Power Take-Off is a high-quality replacement...
    29-07050034
    SKU:
    29-07050034
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $1,401.99
    Qty in Cart: 0
    Price:
    $1,401.99
    Subtotal:
  • BESTfit Stud Kit Replaces 717086X

    BESTfit Stud Kit Replaces 717086X

    BESTFIT TRUCK PARTS

    $80.99
    Stud Kit By BESTfitEnsure a strong and reliable PTO installation with the BESTfit Stud Kit, a premium replacement for 717086X designed specifically for Chelsea 280 Series PTO applications. This...
    29-07050030
    SKU:
    29-07050030
    Position:
    Kit Full
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $80.99
    Qty in Cart: 0
    Price:
    $80.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 5932338, AP65153, T434814

    BESTfit DEF Sensor Head Assembly Replaces 5932338, AP65153, T434814

    BESTFIT TRUCK PARTS

    $914.99
    Diesel Exhuast Fluid Sensor Head Assembly By BESTfit Replaces 5932338, AP65153, T434814Maintain DEF system reliability with the BESTfit DEF Sensor Head Assembly. Designed for accurate monitoring of...
    29-06070037
    SKU:
    29-06070037
    Height Options:
    13 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $914.99
    Qty in Cart: 0
    Price:
    $914.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 231064, 5066895, 85A7476

    BESTfit DEF Sensor Head Assembly Replaces 231064, 5066895, 85A7476

    BESTFIT TRUCK PARTS

    $1,778.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 231064, 5066895, 85A7476Maintain precise emissions system performance with the BESTfit DEF Sensor Head Assembly, a premium replacement...
    29-06070039
    SKU:
    29-06070039
    Height Options:
    22 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,778.99
    Qty in Cart: 0
    Price:
    $1,778.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 2515990C3, 601965, 5511564

    BESTfit DEF Sensor Head Assembly Replaces 2515990C3, 601965, 5511564

    BESTFIT TRUCK PARTS

    $1,065.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 2515990C3, 601965, 5511564Trust the BESTfit DEF Sensor Head Assembly to restore proper emissions monitoring. This high-quality component...
    29-06070033
    SKU:
    29-06070033
    Product Type:
    Fuel Tanks
    Height Options:
    11 1/2 Inch
    Make:
    Universal Items
    $1,065.99
    Qty in Cart: 0
    Price:
    $1,065.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces AP65151, 5511561, GA111561

    BESTfit DEF Sensor Head Assembly Replaces AP65151, 5511561, GA111561

    BESTFIT TRUCK PARTS

    $1,572.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces AP65151, 5511561, GA111561Restore accuracy to your DEF system with the BESTfit DEF Sensor Head Assembly. Engineered for CAT C4.4-style...
    29-06070035
    SKU:
    29-06070035
    Product Type:
    Fuel Tanks
    Height Options:
    22 Inch
    Make:
    Universal Items
    $1,572.99
    Qty in Cart: 0
    Price:
    $1,572.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 3329295, 4812011099, 501740

    BESTfit DEF Sensor Head Assembly Replaces 3329295, 4812011099, 501740

    BESTFIT TRUCK PARTS

    $1,345.99
    Diesel Exhuast Fluid Sensor Head Assembly By BESTfit Replaces 3329295, 4812011099, 501740Maintain peak emissions system performance with the BESTfit DEF Sensor Head Assembly. Designed for Diesel...
    29-06070038
    SKU:
    29-06070038
    Height Options:
    18 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,345.99
    Qty in Cart: 0
    Price:
    $1,345.99
    Subtotal:
  • BESTfit DEF Pump 2.2 For Cummins & Caterpillar Replaces 098644D204, 4387305, 5EL058

    BESTfit DEF Pump 2.2 For Cummins & Caterpillar Replaces 098644D204, 4387305, 5EL058

    BESTFIT TRUCK PARTS

    $1,145.99
    Diesel Exhaust Fluid Pump 2.2 By BESTfit Replaces 098644D204, 4387305, 5EL058 Fits Cummins & CaterpillarUpgrade your emissions system with the BESTfit DEF Pump 2.2, a premium replacement for part...
    29-06070024
    SKU:
    29-06070024
    Product Type:
    Exhaust
    Style Options:
    Cummins
    Make:
    Universal Items
    $1,145.99
    Qty in Cart: 0
    Price:
    $1,145.99
    Subtotal:
  • BESTfit DEF Pump 2.2 For Cummins Replaces 1819797, 2880158, A662102

    BESTfit DEF Pump 2.2 For Cummins Replaces 1819797, 2880158, A662102

    BESTFIT TRUCK PARTS

    $1,145.99
    Exhaust Fluid Pump 2.2 By BESTfit Replaces 1819797, 2880158, A662102 Fits CumminsOptimize your emissions system with the BESTfit DEF Pump 2.2, a dependable replacement for 1819797, 2880158, and...
    29-06070029
    SKU:
    29-06070029
    Product Type:
    Fuel Tanks
    Style Options:
    Cummins
    Make:
    Universal Items
    $1,145.99
    Qty in Cart: 0
    Price:
    $1,145.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 4623219, 82196511, T434824

    BESTfit DEF Sensor Head Assembly Replaces 4623219, 82196511, T434824

    BESTFIT TRUCK PARTS

    $891.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfitStrengthen emissions system reliability with the BESTfit DEF Sensor Head Assembly, a high-quality replacement for 4623219, 82196511, and T434824...
    29-06070031
    SKU:
    29-06070031
    Product Type:
    Fuel Tanks
    Height Options:
    11 Inch
    Make:
    Universal Items
    $891.99
    Qty in Cart: 0
    Price:
    $891.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 82217519, 918161618, APP41422

    BESTfit DEF Sensor Head Assembly Replaces 82217519, 918161618, APP41422

    BESTFIT TRUCK PARTS

    $1,057.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 82217519, 918161618, APP41422Count on accurate DEF monitoring with the BESTfit DEF Sensor Head Assembly, replacing 82217519, 918161618,...
    29-06070034
    SKU:
    29-06070034
    Height Options:
    18 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,057.99
    Qty in Cart: 0
    Price:
    $1,057.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 3600932, 5913429, 714898

    BESTfit DEF Sensor Head Assembly Replaces 3600932, 5913429, 714898

    BESTFIT TRUCK PARTS

    $887.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfitEnsure consistent emissions performance with the BESTfit DEF Sensor Head Assembly. Built for CAT C3.6 and C4.4 engines, this assembly accurately...
    29-06070020
    SKU:
    29-06070020
    Product Type:
    Fuel Tanks
    Height Options:
    18 Inch
    Make:
    Universal Items
    $887.99
    Qty in Cart: 0
    Price:
    $887.99
    Subtotal:
  • BESTfit DEF Fluid Level & Temperature Sensor For Paccar Replaces AP65148, GA617002, 216127002

    BESTfit DEF Fluid Level & Temperature Sensor For Paccar Replaces AP65148, GA617002, 216127002

    BESTFIT TRUCK PARTS

    $286.99
    DEF Fluid Level & Temperature Sensor By BESTfit Replaces AP65148, GA617002, 216127002 Fits PaccarSupport optimal SCR emissions performance with the BESTfit DEF Fluid Level & Temperature Sensor, a...
    29-06070030
    SKU:
    29-06070030
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $286.99
    Qty in Cart: 0
    Price:
    $286.99
    Subtotal:
  • BESTfit DEF Pump 2.2 For Cummins Replaces 098644D207, 2P0131113B, 5EL056

    BESTfit DEF Pump 2.2 For Cummins Replaces 098644D207, 2P0131113B, 5EL056

    BESTFIT TRUCK PARTS

    $1,138.99
    Diesel Exhaust Fluid Pump 2.2 By BESTfit Replaces 098644D207, 2P0131113B, 5EL056 Fits CumminsMaximize the efficiency of your emissions system with the BESTfit DEF Pump 2.2, a reliable replacement for...
    29-06070027
    SKU:
    29-06070027
    Style Options:
    Cummins
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,138.99
    Qty in Cart: 0
    Price:
    $1,138.99
    Subtotal:
  • BESTfit Doser Injector Mounting Hardware Kit For Cummins

    BESTfit Doser Injector Mounting Hardware Kit For Cummins

    BESTFIT TRUCK PARTS

    $89.99
    Doser Injector Mounting Hardware Kit By BESTfit Replaces 2120750011, 4376837, NMD4376837 Fits Cummins EngineKeep your doser injector securely mounted with the BESTfit Doser Injector Mounting Hardware...
    29-06070021
    SKU:
    29-06070021
    Product Type:
    Fuel Tanks
    Material Options:
    Stainless Steel
    Style Options:
    Cummins
    Make:
    Universal Items
    $89.99
    Qty in Cart: 0
    Price:
    $89.99
    Subtotal:
  • BESTfit Doser Injector Gasket For Cummins Engine Replaces 4354280, 2885890, A029Y977

    BESTfit Doser Injector Gasket For Cummins Engine Replaces 4354280, 2885890, A029Y977

    BESTFIT TRUCK PARTS

    $50.99
    Doser Injector Gasket Gasket By BESTfit Replaces 4354280, 2885890, A029Y977 Fits Cummins EngineMaintain proper injector sealing with the BESTfit Doser Injector Gaske for Cummins engines. Constructed...
    29-06070023
    SKU:
    29-06070023
    Product Type:
    Fuel Tanks
    Material Options:
    Stainless Steel
    Style Options:
    Cummins
    Make:
    Universal Items
    $50.99
    Qty in Cart: 0
    Price:
    $50.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly Replaces 2515991C2, 4378048, 5510447

    BESTfit DEF Sensor Head Assembly Replaces 2515991C2, 4378048, 5510447

    BESTFIT TRUCK PARTS

    $1,160.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfitKeep your emissions system running efficiently with the BESTfit DEF Sensor Head Assembly, a direct replacement for part numbers 2515991C2, 4378048,...
    29-06070026
    SKU:
    29-06070026
    Height Options:
    17 1/2 Inch
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $1,160.99
    Qty in Cart: 0
    Price:
    $1,160.99
    Subtotal:
  • BESTfit DEF Doser Injector Kit For Cummins Engine Replaces 2121301002

    BESTfit DEF Doser Injector Kit For Cummins Engine Replaces 2121301002

    BESTFIT TRUCK PARTS

    $131.99
    Diesel Exhuast Fluid Injector Kit By BESTfit Replaces 2121301002 Fits Cummins EngineKeep your DEF system performing reliably with the BESTfit DEF Doser Injector Kit a replacement for Cummins engines...
    29-06070022
    SKU:
    29-06070022
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • BESTfit DEF Fluid Level & Temperature Sensor Replaces 30B1514, 46850454, 621246

    BESTfit DEF Fluid Level & Temperature Sensor Replaces 30B1514, 46850454, 621246

    BESTFIT TRUCK PARTS

    $1,263.99
    Diesel Exhaust Fluid Fluid Level & Temperature Sensor By BESTfitKeep your DEF system functioning properly with the BESTfit DEF Fluid Level & Temperature Sensor, replacing 30B1514, 46850454, and...
    29-06070019
    SKU:
    29-06070019
    Product Type:
    Fuel Tanks
    Height Options:
    18 Inch
    Make:
    Universal Items
    $1,263.99
    Qty in Cart: 0
    Price:
    $1,263.99
    Subtotal:
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Aftermarket Parts for Kenworth T300 & T450 Trucks

We stock hundreds of critical repair and replacement parts for the T300 and classic T450 model. Our goal is to get you the hardware that’ll maintain your vocational Kenworth truck for years to come. Whether you need engine-cooling components, HVAC parts, air brake replacements, or suspension hardware parts, they’re all available for purchase and ready to ship out of our 30,000-square-foot warehouse.

Kenworth T300 Parts & Accessories

Exterior Upgrades & Chrome: Blind-mount front bumpers, grilles, LED cab lights, mirrors, visors, and hood trim accents. Interior Cab Customizations: Floor trim accessories, gauge panel trim, air brake dash knobs, and cab roof trim upgrades. Mechanical & System Replacements: Larger diesel fuel tanks, suspension components, engine parts, and brake components.

Kenworth T450 Parts & Accessories

Bumpers & Exterior Dressings: Custom front bumpers, OEM and Texas-style bumper options, stainless steel or chrome finishes, grilles, and cab lighting. Dash Accessories & Trim: Interior panel upgrades, custom dash knobs, floor trim kits, and driver-focused cabin accents. Drivetrain & Replacement Components: High-capacity fuel storage upgrades, system replacement parts, and reliable mechanical hardware.

Why Upgrade Your Kenworth Medium-Duty Rig?

Boost Visual Appeal: Chrome cab lights, bold grille inserts, and custom bumpers give your truck a clean, head-turning look on the road or at the dock. Improve Cab Comfort: Add floor trim kits, updated door panels, and dash accessories to create a more comfortable, driver-friendly workspace. Increase Efficiency: Larger fuel storage capacity and ergonomic fuel tank accessories give you more range between fuel stops—perfect for regional hauls or long shifts. Cost-Effective Replacements: Get high-quality parts at a better price than many OEM options, all with reliable fit and function. Custom Options: Choose from multiple finishes, materials, and configurations to match your style and how you use your truck.

Frequently Asked Questions About Kenworth T300-T450 Parts

What year models are compatible with your T300-T450 bumpers and parts?

Our Kenworth T300-T450 parts typically fit models from 1994 through 2008, when these trucks were in production. However, compatibility can vary by specific part. The T300 was produced from 1994-2007, while the T330 and T440 ran through 2008. Always check the product description for exact year ranges, or contact our team with your OEM number for guaranteed fitment verification.

Are your bumpers made from chrome-plated steel or stainless steel, and which is better for my truck?

We offer both chrome-plated steel and polished stainless steel options. Chrome-plated bumpers provide a mirror-like finish at a lower cost but require regular maintenance to prevent rust and pitting. Stainless steel bumpers cost more upfront but resist corrosion better and maintain their appearance with minimal care. For trucks in harsh weather conditions or coastal areas, we recommend stainless steel. For show trucks or mild climates, chrome-plated options work well with proper maintenance.

Do I need special tools or professional installation for T300-T450 bumpers?

Most bumper installations require basic hand tools including socket sets, wrenches, and possibly a drill for certain accessories. The bumper itself typically weighs 40-80 pounds, so having a helper is strongly recommended. Installation usually takes 2-4 hours depending on whether you're adding accessories like fog lights or tow hooks. While many customers successfully install bumpers themselves, some prefer professional installation, especially when adding electrical components or dealing with rusted mounting brackets.

Will aftermarket bumpers affect my truck's approach angle or ground clearance?

Standard replacement bumpers maintain factory dimensions and won't affect approach angles or clearance. However, heavy-duty bumpers with integrated tow hooks or extended designs may protrude 2-4 inches further than stock, potentially reducing approach angle. Texas-style bumpers and some custom options sit lower, which can reduce ground clearance by 1-2 inches. Always check product specifications for exact measurements to ensure the bumper meets your operational needs.

What's the difference between OEM-style and Texas bumpers for T300-T450 trucks?

OEM-style bumpers replicate the factory design with standard mounting points and original dimensions, making them direct replacements. Texas bumpers (also called Texas square bumpers) feature a distinctive squared-off design that extends further from the truck and sits lower, offering enhanced protection and a custom appearance. Texas bumpers typically include more mounting points for accessories but may require slight modifications to air lines or other components during installation.


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