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Caterpillar 3400 Series Parts

Parts for the Caterpillar 3400 Series — the big mechanical inline-six and V-engine family that includes the 3406, 3408 and 3412. We stock PAI Industries aftermarket parts and our own JAK'S Diesel cylinder heads: cylinder heads, fuel injectors, turbochargers, gaskets, and complete rebuild kits, with cores and full-engine kit support.

Got an OEM, superseded, or competitor part number? Send it over and we'll cross-reference it to the right 3400 Series component. Ships same-day from Colorado, free freight over $1,000. Call or text (720) 445-6249.

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Choosing the Right Caterpillar 3400 Series Parts

Heavy-duty diesel components must be matched to the exact engine and application. Before ordering from this collection, verify the part number, engine model, engine serial number, and any casting or calibration number shown on the original component.

Fitment information to have ready

  • OEM, dealer, casting, or interchange part number
  • Engine manufacturer, model, and engine serial number (ESN)
  • Truck year and model when the component is chassis-specific
  • Core details for remanufactured or exchange components

Need a fitment check?

Use the OEM cross-reference tool or text a clear photo of the part tag to (720) 445-6249. A JAK'S Diesel specialist can confirm the match before the part ships.

Got a Number We Don't List?

Text a photo of the part tag — a specialist crosses it and quotes you fast.

Text a Part-Tag Photo(720) 445-6249