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

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    • FABRICATION COMPONENTS

    FABRICATION COMPONENTS — 1989–1993 DODGE RAM 5.9L CUMMINS (12-VALVE)

    Build clean, reliable custom parts for your First-Gen with CPP Diesel’s curated selection of stainless bends, aluminum tubing, reducers/transitions, V-band flanges & clamps, silicone couplers, T-bolt/constant-tension clamps, weld bungs and fab tools tailored to 1989–1993 Dodge Ram D250/D350 projects.

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    Featured for 1st Gen

    Why Buy from CPP Diesel

    • First-Gen Focus: Parts and hardware that pair well with 1989–1993 Cummins builds.
    • Trusted Brands: CPP in-house, PPE, Vibrant, Diamond Eye, more.
    • Expert Support: Help sizing tubing, couplers, and V-band interfaces for HX35/HX40/S300/S400.
    • Fast Shipping: Popular fab components ship quickly from U.S. warehouses.

    Explore the full 1989–1993 Cummins catalog for complementary upgrades.

    Helpful Notes

    • Measure twice: Match tube OD, coupler ID, and clamp range to avoid leaks.
    • Material choice: 304SS for hot-side/exhaust; 6061 aluminum is light for cold-side piping.
    • V-band sizing: HX35/HX40/S300/S400 outlets differ—confirm flange OD and seat style.
    • Bead your pipes: Beaded tube ends + constant-tension clamps reduce blow-offs under boost.

    Frequently Asked Questions

    What tube size should I use for intercooler piping?

    Most First-Gen builds use 3.0–3.5" cold-side tubing. Verify intercooler/turbo outlets and space before ordering.

    When do I need constant-tension clamps?

    They’re ideal where heat-cycling loosens standard T-bolts—use on hot-side charge pipes and couplers.

    Are V-band connections worth it?

    Yes—V-bands seal well, allow quick service, and save space. Match the flange/clamp to your HX35/HX40/S300/S400 unit.

    Can I mix stainless and aluminum in one system?

    Yes, but keep stainless on hot sections. Use proper transitions and isolate dissimilar metals when possible.

    Do I need to bead aluminum tube ends?

    Highly recommended for boosted applications. Use a bead roller tool for reliable coupler retention.

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