Caterpillar Engines & Parts

Kustom Truck Parts offers premium, direct-fit Caterpillar engine parts and upfit kits engineered for reliable performance in semi-truck repowers, engine conversions, and ongoing maintenance. Caterpillar's legendary torque and durability make it a staple in working trucks, but proper integration demands the right supporting components to ensure precise fitment, optimal cooling, clean electronic interface, and long-term reliability.

Our selection includes conversion-ready hardware like chassis specific mounting brackets, front engine upfit kits, fan hubs, CAC intake elbow kits and more — designed specifically for Caterpillar 3406E, C7, C10, C12, C13, and C15 engines in popular chassis like Peterbilt, Kenworth, Freightliner, and Western Star.

Whether you're rebuilding a CAT-powered rig, addressing common wear items, or completing an engine swap, these high-quality parts eliminate guesswork, reduce installation time, and minimize downtime for owner-operators, diesel shops, and fleets.

Caterpillar Engine Parts Built for Heavy-Duty Performance

Our parts ensure seamless wiring, cooling, mounting, and electronic integration — reducing downtime, eliminating guesswork, and delivering dependable performance for truck owners, mechanics, diesel shops, and conversion builders. Let us help match the right components to tackle your CAT-powered project with confidence

Close-up of a yellow CAT diesel engine with visible hoses, wiring, and fuel filter components.

Caterpillar Parts for Conversions, Repairs, and Upfits

Caterpillar engines are frequently swapped into chassis that started with a different engine make or model creating fitment, routing, cooling, and electronic integration challenges. Kustom Truck Parts carries direct-fit, conversion-ready CAT components to resolve these issues and ensure reliable performance.

  • CAT engine swaps into Peterbilt and Kenworth chassis
  • Replacing damaged engine wiring components
  • Upgrading cooling and intake routing for high-load applications to match the specific chassis
  • Supporting ECM and sensor compatibility in custom builds

Why Buy Caterpillar Engine Parts from Kustom Truck Parts?

Kustom Truck Parts specializes in engineered, direct-fit Caterpillar components that simplify complex conversions, repowers, and upfits while minimizing installation headaches and costly downtime for owner-operators, diesel shops, and fleets.

Choose Kustom for CAT parts that fit right, install faster, and keep your rig running stronger—backed by our knowledge of heavy-duty conversions.

Key benefits include:

  • Parts precision-engineered for heavy-duty CAT platforms with OEM-grade quality and no generic compromises
  • Expert fitment support based on your engine serial number, chassis year/make/model and specific configuration
  • Conversion-focused components—like serpentine front engine upfit kits, fan hubs, CAC intake elbows, stainless braided hoses, and brackets—not typically stocked in general aftermarket catalogs
  • Reliable, long-term real world performance
Close-up of a chrome metal pipe with rubber coupler mounted on a yellow engine block.

Frequently Asked Questions

What Caterpillar engines do you support?

We support many popular on-highway CAT platforms used in truck conversions and rebuilds. We offer engine-to-cab harnesses, brackets, tubing, sensors, and other essential components tailored to Caterpillar models such as the 3406E, C10, C12, C13, C15, and C7.

Are these Caterpillar engine parts OEM or aftermarket?

Our Caterpillar engine parts are premium OEM and engineered aftermarket replacements carefully designed to meet OEM specifications for fit, function, material strength, and performance. We specialize in high-quality, conversion-ready components that address the unique challenges of repowers, engine swaps and heavy-duty maintenance.

Do Caterpillar engine parts require special installation tools?

Most of our Caterpillar engine parts and upfit kits install using standard heavy-duty shop tools commonly found in diesel repair facilities—no exotic or proprietary tools required for the majority of components. This keeps installs straightforward, reducing complexity and downtime.

Can you help identify the right Caterpillar truck engine parts for my build?

Yes. Provide your VIN and engine serial number, and our team can help match the correct components.

Custom Kenworth Trucks With 800+ Horsepower Caterpillar 3406E Engines

Custom-built Kenworth heavy haul trucks, assembled and built by Kustom Truck.

What to Know Before Installing Caterpillar Engine Parts

Installing Caterpillar engine parts into a heavy-duty truck—especially during a conversion—requires more than matching bolt patterns. Electrical compatibility, ECM generation, cinterfacing with the cooling package, and chassis integration all play a role in long-term performance and a seamless, timely swap.

Choose Kustom for CAT parts that fit right, install faster, and keep your rig running stronger—backed by our knowledge of heavy-duty conversions.

When sourcing Caterpillar truck engine parts, it’s important to verify:

  • Engine serial number and ECM type
  • Transmission pairing and communication requirements
  • Mounting alignment within the chassis
  • Interfacing with the cooling package
  • Engine sensor harness compatibility

Overlooking these factors can lead to communication faults, premature component failure and unexpected downtime increasing the overall cost of the project. Using purpose-built CAT components designed for heavy-duty applications helps ensure stable operation and seamless installations.

Caterpillar truck engine parts.

Get Your CAT Parts Built for Engine Conversions

Need help finding the right CAT components for your conversion or rebuild? Our team can verify fitment and recommend the correct Caterpillar engine parts for your truck.

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