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Truck Components

Keeping a semi truck in top condition starts with understanding its many moving parts. Semi truck components include engines, braking systems, suspension setups, fuel systems, electrical networks, and transmissions, each working together to keep your rig running strong. These critical truck parts handle everything from pulling heavy loads to protecting cargo during long hauls.

 

Knowing how each semi truck part functions is vital for preventive maintenance and roadside troubleshooting. Whether you drive a semi daily or manage a fleet, investing time in understanding your vehicle’s core components helps extend service life and boosts performance across every mile.

 

By focusing on maintenance and using quality parts, drivers can lower repair costs, improve fuel efficiency, and keep their trailer and truck road-ready.

  • Thermal Expansion Valve

    Paccar

    Thermal Expansion Valve

    Paccar Thermal Expansion Valve Bolt Hole Diameter: 0.225" Bolt Hole Diameter: 0.38" Length: 2.51" Width: 1.34"   Applications Include: Kenworth T880   Replaces Part Numbers: 1001398381 12-0620A 1812006 327302 830.42009 830.42034 A4965 ABP N83...

    $104.99
  • Freightliner Cab Air Manifold Valve - Cascadia

    Freightliner

    Cab Air Manifold Valve - Cascadia

    The Cab Air Manifold Valve - Cascadia from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.Cab Air Manifold Freightliner Cascadia...

    $244.17
  • Freightliner DEF Tank Harness

    Freightliner

    DEF Tank Harness

    The DEF Tank Harness from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.Fitment: Confirm this part fits your truck's make,...

    $136.11
  • Newstar Air Brake Hose Assembly

    Newstar

    Air Brake Hose Assembly

    Air Brake Hose Assembly 26" Length Swivel Fitting 3/8"-18 Fitting Hose Diameter - 1/2" Max Operating Pressure - 225 lbs/sq in Max Operating Temp - 212  

    $12.67
  • Atro High Temp Front Motor Mount (Polyurethane)

    Atro

    Atro High Temp Front Motor Mount (Polyurethane)

    The Atro High Temp Front Motor Mount (Polyurethane) from Atro is a genuine Atro heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.High Temp Polyurethane Motor Mount Bushing Front Mount...

    $49.73
  • Bergstrom Evaporator Coil

    Bergstrom

    Evaporator Coil

    Evaporator Coil Peterbilt Application 325 Series, 330 Series, 337 Series, 348 Series, 365 Series, 367 Series, 386 Series, 389 Series Years 2011-2023 OEM Number - 100473781 Cross Reference:  1000473781, 1001439657BSM, 1801104, 400-5115, 6715, TE411083

    $362.72
  • Meritor Rear Axle Breather and Tube Kit

    Meritor

    Rear Axle Breather and Tube Kit

    The Rear Axle Breather and Tube Kit from Meritor is a genuine Meritor heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Drive Axle Breather...

    $11.07
  • Freightliner DEF Tank Cap

    Freightliner

    DEF Tank Cap

    The DEF Tank Cap from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.Fitment: Confirm this part fits your truck's make, model,...

    $33.37
  • Freightliner Pressure Switch

    Freightliner

    Pressure Switch

    The Pressure Switch from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.Pressure Switch Normally Closed 103 Park LockFitment:...

    $38.78
  • Freightliner Pressure Switch

    Freightliner

    Pressure Switch

    The Pressure Switch from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.Pressure Switch Normally Open 71 Low AirFitment: Confirm...

    $37.20
  • Alliance Binary Pressure Switch

    Alliance

    Binary Pressure Switch

    The Binary Pressure Switch from Alliance is a genuine Alliance heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.Fitment: Confirm this part fits your truck's make, model, and year...

    $12.54
  • Alliance High Pressure Transducer

    Alliance

    High Pressure Transducer

    The High Pressure Transducer from Alliance is a genuine Alliance heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.Fitment: Confirm this part fits your truck's make, model, and year...

    $35.09
  • Alliance Expansion Valve

    Alliance

    Expansion Valve

    Expansion Valve Mounting Type: Block Refrigerant Type: R12/R134a Fitting Type: Female O-Ring Rating: 1.50 T Maximum Operating Pressure: 80 psig Operating Temperature: 40°F Mounting Hole Diameter: 0.25 in Standard Evaporator Side Outlet Size:...

    $27.92
  • Paccar Peterbilt Toggle Switch

    Paccar

    Peterbilt Toggle Switch

    The Peterbilt Toggle Switch from Paccar is a genuine Paccar heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.Fitment: Confirm this part fits your truck's make, model, and...

    $59.94
  • Freightliner Turn Signal Lever

    Freightliner

    Turn Signal Lever

    The Turn Signal Lever from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.Fitment: Confirm this part fits your truck's make,...

    $114.90
  • Freightliner

    Tank Top Grille Strip

    The Tank Top Grille Strip from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. A quality upgrade that adds style and function to your rig.Top Grille Strip Stainless SteelFitment: Confirm this part fits your truck's make,...

    $170.76
  • 7 Way Plug

    7 Way Plug

    The 7 Way Plug from Fitzgerald Truck Parts is a heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.Fitment: Confirm this part fits your truck's make, model, and year before ordering —...

    $12.25
  • Alliance 2 Position Female Connector Kit Alliance 2 Position Female Connector Kit

    Alliance

    2 Position Female Connector Kit

    The 2 Position Female Connector Kit from Alliance is a genuine Alliance heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.Fitment: Confirm this part fits your truck's make, model, and...

    $48.53
  • Newstar Pinion Seal and Nut Kit

    Newstar

    Pinion Seal and Nut Kit

    The Pinion Seal and Nut Kit from Newstar is a genuine Newstar heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.Pinion Nut and Seal KitFitment: Confirm this part fits your truck's...

    $30.00
  • Newstar 15' Green Electric Cable

    Newstar

    15' Green Electric Cable

    The 15' Green Electric Cable from Newstar is a genuine Newstar heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.15' Green Electric Cable 7 WayFitment: Confirm this part fits your...

    $98.05
  • Newstar Coiled Air Line Set

    Newstar

    Coiled Air Line Set

    The Coiled Air Line Set from Newstar is a genuine Newstar heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Coiled Air Line Set 1 - Red Hose 1...

    $46.75
  • Newstar Coiled Air Line Set

    Newstar

    Coiled Air Line Set

    The Coiled Air Line Set from Newstar is a genuine Newstar heavy-duty truck part you can count on. Engineered for the demands of heavy-duty diesel powertrains, it's built to deliver dependable performance mile after mile.Coiled Air Line Set 15' Length 40"...

    $52.70

Truck Engines: Power and Performance

Our inventory features engines tailored for diverse hauling demands, from light local jobs to major freight hauls. Drivers looking for maximum power and reliability will appreciate our lineup, which covers everything from high-torque options to engines built for long-distance durability.

When it comes to aftermarket semi truck parts, we offer premium engines designed for better performance, smoother driving, and lower operating costs. Compared to basic models, our engines deliver greater efficiency, helping drivers stretch every gallon of fuel.

You can also support your engine's health with our maintenance kits. Built to improve airflow, optimize combustion, and reduce wear, these kits make a real difference in both daily driving and long-term ownership.

Braking Systems: Safety and Reliability

Our selection of brake parts includes high-performance brake pads, air brake valves, slack adjusters, and complete drum and disc brake kits. We help you address common problems like uneven wear or reduced braking power with our top-rated replacement products. Our braking solutions not only improve stopping distances but also support regulatory compliance for commercial truck parts standards.

No matter if you drive a Freightliner Cascadia or any other popular semi model, we have dedicated braking system solutions ready to ship. We encourage you to check out our customer reviews which frequently highlight how we help provide safer stops, longer part life, and peace of mind on the road.

Suspension Systems: Comfort and Stability

Handling heavy duty truck parts is about more than brute strength -- comfort and stability are just as important. Our catalog features suspension components like air springs, shocks, and control arms, built to absorb bumps and prevent cargo shifts.

Upgrading your suspension can also boost your fuel efficiency by creating less resistance on the road. For drivers tired of rough rides, our upgrade kits offer an easy, effective solution that improves both handling and overall driving experience.

With a smoother ride, drivers stay comfortable longer, and your semi truck endures less wear and tear on essential components. All of this translates to better ROI.

Other Truck Components

At Fitzgerald Truck Parts, we offer a full lineup of semi truck components designed to support every aspect of your rig's performance. Our selection includes:

  • Cooling and Air Systems: Maintain optimal engine performance with our radiators, intake manifolds, fans, and other essential parts.
  • Heating and AC: Stay comfortable year-round with our blower motors, resistors, switches, receiver driers, AC lines, and evaporator cores.
  • Body Components: Find bumpers, headlights, and body panel upgrades that restore or customize your semi truck's look.
  • Transmission and Components: From transmission oil coolers to shifter poles and reman transmissions, we provide quality parts to keep your truck shifting smoothly.
  • Wheels and Tires: Keep rolling strong with durable wheels, wheel covers, and mudflaps built for heavy duty demands.
  • Electrical System Parts: Power up with alternators, starters, wiring harnesses, sensors, and other essential components.
  • Exhaust Systems: Shop exhaust pipes, heat shields, mufflers, and full exhaust kits for maximum efficiency and durability.
  • Interior and Exterior Accessories: Customize your cab with sun visors, bug deflectors, mirrors, air brake knobs, wood and leather steering wheel replacements, and more.

Our trailer parts selection help keep your rig in peak condition. We cover everything needed to outfit your truck or trailer for maximum performance, safety, and reliability. With us, keeping your rig in top shape has never been easier -- or more affordable.

Get the Semi Truck Components You Need Today

Semi trucks are intricate machines where every part counts. From the braking system to the fuel tank, every component plays a role in safety, performance, and cost efficiency. Routine maintenance and smart part replacements prevent unexpected breakdowns and help drivers avoid costly delays.

The future of trucking promises exciting advancements like smart braking technologies, lighter materials, and predictive maintenance tools. Staying ahead of these trends means working with a supplier that understands the evolving needs of the industry.

When you're ready to upgrade or replace components, we're here with expert advice and an extensive selection of high-quality aftermarket parts designed to keep your truck running strong.

Why Buy from Fitzgerald Truck Parts

Choosing us means more than just buying truck parts -- it means partnering with a team committed to quality, service, and your success. Here's why drivers and fleets trust us:

  • Brands You Trust: We stock parts from top brands and manufacturers known for quality and reliability.
  • Competitive Pricing: Save more with our everyday deals and seasonal parts specials.
  • Expert Support: Our knowledgeable team is here to help you match the right part to your truck or trailer.
  • Fast Shipping: Get the parts you need without the long wait.
  • Extensive Inventory: Whether you need a new fuel tank, upgraded brake pads, or durable trailer parts, we've got you covered.

We make it easy to find the best gear for your heavy duty truck. Shop online, browse by category, or contact us with any questions.