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

    • Shop by Brand

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    • TRANSMISSION / TRANSFER CASE

    TRANSMISSION / TRANSFER CASE — 2003–2007 DODGE RAM 5.9L CUMMINS

    Meet the backbone of your build. CPP Diesel engineers and supplies a CPP-exclusive Extreme Duty manual lineup—NV4500, NV5600, and G56—built in-house for real Cummins torque. Pair our manuals with proven 48RE options, deep pans, coolers, and NP271/NP273 parts to tow harder, race smarter, and daily with confidence.

    Featured: CPP-Exclusive Extreme Duty Manuals

    Automatic (48RE) — Towing & Performance

    Manual Clutches & Hydraulics

    Transfer Case — NP271 / NP273

    Why Buy Drivetrain from CPP Diesel?

    • CPP-exclusive Extreme Duty manuals: purpose-built NV4500/NV5600/G56 options for serious torque and towing.
    • Complete 48RE coverage: proven SunCoast, BD, ATS builds plus pans, coolers, and electronics fixes.
    • End-to-end parts: clutches, hydraulics, lines, and NP271/NP273 internals for one-stop service.

    Tech Notes & Fitment

    • Year splits: NV5600 through early ’05; G56 from ~’05.5–’07. 48RE automatics across ’03–’07.
    • Cooling & ATF: Deep pans and cooler line upgrades help keep 48RE temps in check under load.
    • Manual clutch break-in: Most SB/Valair kits require 500–1,000 gentle miles prior to hard pulls.

    Frequently Asked Questions

    What’s special about CPP’s Extreme Duty NV4500/NV5600/G56?

    They’re CPP-exclusive manual builds with upgraded internals and assembly practices to handle Cummins torque with smoother shifts and higher durability. See our manuals hub for specs and availability by year.

    Should I choose NV5600 or G56 for my 03–07?

    ’03–’05 trucks typically use NV5600; ’05.5–’07 use G56. If you’re swapping, NV5600 is a cast-iron tank with close ratios; G56 is lighter with great shift feel. We can match gearing, clutch, and hydraulics to your power and use case.

    Best reliability upgrades for a 48RE tow rig?

    Start with a quality build (SunCoast/BD), add a deep pan, metal pressure transducer upgrade, and braided line/bypass kit to control heat and line pressure.

    Which transfer case parts do I need for a rebuild?

    Match NP271 vs NP273, then choose a rebuild kit (bearings/seals), chain, input/output shafts, and any worn forks. Our 271/273 section groups everything by platform.

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