Engine Upfit Parts & Upgrades

An often overlooked step when completing an engine swap in your heavy-duty truck with a Caterpillar, Cummins, or Detroit Diesel engine will require some combination of additional upfit components to configure the engine for the new chassis it's being mounted into. Kustom Truck Parts stocks conversion-specific engine upfit parts and accessories tailored for Kenworth, Peterbilt, Freightliner, and Western Star chassis.

Our upfit lineup addresses these final-stage needs:

  • Serpentine Belt Kits to replace aging V-belt systems
  • Accessory drive components ( mounting brackets, tensioners, and idler pulleys)
  • Fan Hubs, blades, and fan belt sets for proper alignment
  • A/C compressors, suction and discharge lines, engineered chassis specific
  • Blowby modification kits and stainless breather tubes, and more

Unlike generic maintenance parts, these are engineered for repower and conversion scenarios—ensuring reliable accessory performance, correct driveline geometry, and road-ready durability without custom fabrication.

Browse below for your engine and chassis match—our parts remove the guesswork and allow for a straightforward installation. Pair with our fuel line plumbing, exhaust components, engine harnesses, or mounting brackets for a fully integrated build. Need guidance on the right upfit parts for your setup? Contact our team for expert fitment confirmation.
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