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  • FORD POWERSTROKE
  • GM DURAMAX
  • COMMERCIAL / INDUSTRIAL
  • CUMMINS CONVERSION PARTS
  • CPP GEAR
  • USED PARTS
  • SHOP BY BRAND

    • Shop by Brand

  • YUKON GEAR AND AXLE
  • ZUMBROTA
  • DORMAN
  • BDS SUSPENSION
  • USA STANDARD GEAR
  • PPE
  • ATS DIESEL
  • BD DIESEL
  • AFE POWER
  • INDUSTRIAL INJECTION
  • View all Brands

    • ENGINE PARTS

    ENGINE PARTS & ACCESSORIES — 1989–1993 DODGE RAM 5.9L CUMMINS (12-VALVE)

    Build, refresh, or upgrade your first-gen Dodge Ram D250/D350 (1989–1993) 5.9L 12-valve Cummins with proven parts from CPP Diesel. From full rebuild kits and rotating assembly components to valve-train, gaskets, and OE hardware, this section is curated specifically for the VE-pump 12-valve platform for reliable towing, daily driving, and performance builds.

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    Why Buy from CPP Diesel

    • First-Gen Focus: Parts vetted for 1989–1993 VE-pump 12-valve applications.
    • Premium Brands + OE: Cummins, Total Seal, Fluidampr, Hamilton, Interstate McBee, Gator Fasteners, and more.
    • Expert Support: Real diesel techs to help with fitment, break-in, and torque procedures.
    • Fast Shipping: Most items ship quickly from US warehouses.

    Need something beyond engine internals? Explore the full 1989–1993 Dodge Cummins catalog for fuel, turbo, cooling, driveline, and more.

    Helpful Notes

    • Compatibility: 1989–1993 trucks use a mechanical VE injection pump and 12-valve cylinder head. Some components interchange across years, but always verify part numbers and torque specs.
    • Balance & Vibration: A quality harmonic damper is crucial for longevity on performance or heavy-towing builds.
    • Fasteners: Upgraded head/main studs provide clamping stability for higher boost and sustained load.

    Frequently Asked Questions

    Do I need head studs on a stock 12-valve?

    For stock boost and mild tuning, OE bolts can suffice. If you tow heavy, plan higher boost, or want extra insurance against head-gasket issues, head studs are a smart upgrade.

    What valve springs should I run with a larger turbo?

    Higher drive/boost pressure and RPM benefit from upgraded springs to prevent valve float. See VALVE SPRINGS / RETAINERS (89–93) for matched options.

    Is a harmonic damper worth it on a working truck?

    Yes—dampers reduce torsional vibration, helping protect bearings, the crank, and accessories. Browse HARMONIC DAMPERS.

    Should I buy a full rebuild kit or piece parts together?

    If the bottom end is open, a complete rebuild kit ensures matched components, consistent clearances, and typically better value than piecemeal sourcing.

    Will later-year 5.9L components fit my 1989–1993?

    Many do, but not all—especially valve-train and front-gear components. Check each listing’s fitment and ask our techs if you’re unsure.

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