AW-17220743903, GT-K4ZB5X3V
Dial in bulletproof reliability and confident traction on your 2003–2007 Dodge Ram 2500/3500 (5.9L Cummins). From AAM 11.5" rear to AAM 9.25" front components, CPP Diesel stocks the ring & pinions, master install kits, lockers/LSDs, U-joints, driveshafts, and heavy-duty diff covers you need for towing, work, off-road, or competition.
Browse the full DIFFERENTIAL & DRIVETRAIN category for 03–07 Cummins
Most trucks use an AAM 11.5" rear and an AAM 9.25" front. Confirm by VIN lookup, axle tag, or by measuring/inspecting the cover.
Yes—fresh bearings, shims, seals, and hardware are strongly recommended any time you change ring & pinion to ensure correct setup and long service life.
For year-round street and towing, many prefer a clutch-type LSD (e.g., Dura Grip). For maximum off-road/competition traction, a mechanical locker (e.g., Grizzly) is ideal.
As tire diameter increases, consider moving from 3.73 to 4.10 or 4.56 to restore drivability. Match to your tire size, trans, and intended RPM at cruise.
Yes—performance covers increase fluid capacity and surface area, aiding cooling and simplifying service via drain and fill ports. Always follow the cover’s fill-level guidance.
It’s not recommended. New gears should be paired with new bearings and setup parts to prevent noise and premature wear.
Yes—see our 03–07 Steering / Suspension section for complements like track bars, tie rods, and braces.