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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.

  • Newstar 3 in 1 Wrap

    Newstar

    3 in 1 Wrap

    The 3 in 1 Wrap from Newstar is a genuine Newstar heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.3 in 1 Air Line Wrap 15' LengthFitment: Confirm this part fits your...

    $151.04
  • Freightliner Service Kit Harness

    Freightliner

    Service Kit Harness

    The Service Kit 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.A/C Service Kit HarnessFitment: Confirm this part...

    $43.29
  • Alliance Heater and A/C Control

    Alliance

    Heater and A/C Control

    The Heater and A/C Control 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...

    $288.70
  • Fuller Transmission Boot

    Fuller

    Fuller Transmission Boot

    The Fuller Transmission Boot from Fuller is a genuine Fuller 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.Fitment: Confirm this part fits...

    $5.30
  • Wabco Purge Valve Kit

    Wabco

    Purge Valve Kit

    The Purge Valve Kit from Wabco is a genuine Wabco 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 year...

    $58.45
  • Newstar Gladhand

    Newstar

    Gladhand

    The Gladhand from Newstar is a genuine Newstar 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 year before...

    $27.93
  • Newstar Kenworth Headlamp, Driver - RH

    Newstar

    Kenworth Headlamp, Driver - RH

    The Kenworth Headlamp, Driver - RH from Newstar is a genuine Newstar heavy-duty truck part you can count on. Bright, durable, and built to give your truck a finished, custom look.Kenworth Style Headlight Passenger Side - RH Replaces Part Numbers: 564...

    $124.99
  • Newstar Relay

    Newstar

    Relay

    The Relay from Newstar is a genuine Newstar 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 year before...

    $40.96
  • Newstar Hood Pivot Bolt Kit with Bushing

    Newstar

    Hood Pivot Bolt Kit with Bushing

    The Hood Pivot Bolt Kit with Bushing from Newstar is a genuine Newstar heavy-duty truck part you can count on. Made to bring back tight steering and a comfortable ride, load after load.Hood Pivot Bushing Bolt Kit Comes with BushingsFitment: Confirm this...

    $87.70
  • Newstar Shift Cylinder

    Newstar

    Shift Cylinder

    The Shift Cylinder 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.Fitment: Confirm this part fits your truck's make, model, and year before...

    $74.56
  • Newstar 3 Way Pilot Valve Newstar 3 Way Pilot Valve Newstar 3 Way Pilot Valve

    Newstar

    3 Way Pilot Valve

    3 Way Pilot Valve Dimensions:2-1/4 W x 2-1/4 D x 2 H InchMounting Holes:1/4 on 1-5/8 centersNormally Closed Port:1/4 InchNormally Open Port:1/4 InchPilot Port:1/8 Inch Suspension Port:1/4 Inch

    $24.15
  • Paccar Heater Control Knob

    Paccar

    Heater Control Knob

    The Heater Control Knob from Paccar is a genuine Paccar heavy-duty truck part you can count on. A quality upgrade that adds style and function to your rig.Fitment: Confirm this part fits your truck's make, model, and year before ordering — our parts team...

    $7.65
  • Alliance Air  Dryer Cartridge (AD-IS/SP)

    Alliance

    Air Dryer Cartridge (AD-IS/SP)

    The Air Dryer Cartridge (AD-IS/SP) 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...

    $19.65
  • Newstar ABS Relay Valve with Knob and Power Cable Newstar ABS Relay Valve with Knob and Power Cable Newstar ABS Relay Valve with Knob and Power Cable Newstar ABS Relay Valve with Knob and Power Cable Newstar ABS Relay Valve with Knob and Power Cable

    Newstar

    ABS Relay Valve with Knob and Power Cable

    ABS Relay Valve Comes with Knob and Power Cable Replaces Part Numbers: 170.955378 24900171 4006120090 40502928 46040401100 4721950230 4721950260 955378 S4721950330  

    $121.25
  • Freightliner Windshield  Wiper Motor

    Freightliner

    Windshield Wiper Motor

    The Windshield Wiper Motor 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.Windshield Wiper Motor Freightliner...

    $45.35
  • Freightliner 45* Fitting Elbow

    Freightliner

    45* Fitting Elbow

    The 45* Fitting Elbow from Freightliner is a genuine Freightliner heavy-duty truck part you can count on. A great way to dress up your rig while keeping airflow where it should be — and built for an easy install.45 Degree Fitting #8 O-RingFitment:...

    $14.82
  • Freightliner Fuel Level  Sensor

    Freightliner

    Fuel Level Sensor

    The Fuel Level Sensor from Freightliner is a genuine Freightliner 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.Fuel Level Sensor 23"...

    $43.09
  • Apsco 3 Way High Flow Electric Solenoid Valve - 12V

    Apsco

    Apsco 3 Way High Flow Electric Solenoid Valve - 12V

    The Apsco 3 Way High Flow Electric Solenoid Valve - 12V from Apsco is a genuine Apsco heavy-duty truck part you can count on. A quality heavy-duty truck part built to keep you running and looking your best.3 Way High Flow Solenoid Valve Electric 12V 1/4...

    $187.32
  • 7/8" U-Bolt

    7/8" U-Bolt

    The 7/8" U-Bolt from Fitzgerald Truck Parts is a heavy-duty truck part you can count on. Made to bring back tight steering and a comfortable ride, load after load.7/8" Diameter U-Bolt 3" Width 18" Leg Length 20.5" Overall LengthFitment: Confirm this part...

    $99.99
  • Spicer Drive Shaft Nut

    Spicer

    Spicer Drive Shaft Nut

    The Spicer Drive Shaft Nut from Spicer is a genuine Spicer heavy-duty truck part you can count on. Built to the standards heavy-duty truckers count on — dependable, durable, and ready to work.Spicer Driveshaft NutFitment: Confirm this part fits your...

    $18.90
  • Freightliner Voltmeter Gauge

    Freightliner

    Voltmeter Gauge

    The Voltmeter Gauge 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.Freightliner Voltmeter GaugeFitment: Confirm this part...

    $102.13

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.