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  • DODGE CUMMINS
  • FORD POWERSTROKE
  • GM DURAMAX
  • COMMERCIAL / INDUSTRIAL
  • CUMMINS CONVERSION PARTS
  • CPP GEAR
  • USED PARTS
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    • DIFFERENTIAL AND DRIVETRAIN

    DIFFERENTIAL & DRIVETRAIN — 2007.5–2012 DODGE RAM 6.7L CUMMINS

    CPP Diesel stocks the AAM 9.25 (front) and AAM 11.5 (rear) components your late-3rd/early-4th gen Ram depends on—heavy-duty differential covers, ring & pinions with install kits, U-joints, bearings/seals, and traction control upgrades. Shop proven parts that fit and last on 2007.5–2012 Ram 2500/3500.

    Browse the full 07.5–12 DIFFERENTIAL & DRIVETRAIN category →

    Shop by Component

    Why Buy Drivetrain Parts from CPP Diesel?

    • AAM-specific expertise: We call out front 9.25 vs rear 11.5 fitment and pinion-bearing splits so you get the right kit the first time.
    • Tow-ready durability: Fin-cooled covers, quality bearings, and correct setup parts extend life under load.
    • One-stop selection: From U-joints and seals to complete reman axles and traction control, it’s all here.

    Tech Notes & Fitment

    • Pinion bearing split (AAM 11.5): Early 11.5s use a larger (4.125" OD) inner pinion bearing—choose overhaul/gear kits accordingly.
    • Match ratios: Always re-gear front and rear to the same ratio; verify axle tags or existing gears before ordering.
    • Setup essentials: Use new bearings, crush sleeve/shims, and high-quality gear oil after install; re-torque cover bolts after heat cycles.

    Frequently Asked Questions

    Do I need a master install kit when changing gears?

    Yes—new bearings, shims, seals, and hardware ensure proper preload/backlash and quiet operation. See our AAM 11.5 master kits and AAM 9.25 bearing kits.

    What’s the benefit of a high-capacity diff cover?

    Cast/aluminum finned covers add fluid capacity, cooling, and easy drain/fill ports—great for towing and heavy use. Popular options include Mag-Hytec AA 14-11.5 and aFe 46-70392.

    Which U-joints fit my truck?

    Many rear shafts use 1480 series joints such as Spicer 5-188X; the front AAM 9.25 commonly uses 1485 axle joints like Yukon YUJ925. Always verify by VIN/measurement.

    How do I cut wheel hop after adding power?

    Traction bars stabilize the axle under load; our CPP weld-on bars are a long-term solution for big torque builds.

    Shop all 07.5–12 Differential & Drivetrain parts at CPP Diesel →

    Need steering stability too? See 07.5–12 Steering & Suspension for stabilizers and control arms.

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