Product Description
SOUTH BEND 13125-OK-HD HEAVY DUTY CLUTCH KIT – 1988–2004 DODGE RAM 5.9L CUMMINS
Work-ready holding power with smooth street manners. The South Bend 13125-OK-HD is a single-disc, full-organic heavy duty clutch and flywheel package engineered for 5.9L Cummins trucks that tow and haul. It delivers confident engagement, predictable pedal feel from a diaphragm pressure plate, and the durability you expect from a ductile flywheel and HD friction materials.
- Rating: up to ~425 HP / ~900 ft-lbs (vehicle dependent)
- Disc: 13" (330 mm) full-organic, sprung hub
- Pressure Plate: Diaphragm style for lighter pedal effort
- Flywheel: Ductile iron, included
- Input: 1.25" diameter, 10-spline (OE Getrag/NV4500/early NV5600 Non-HO)
FITMENT
- Engine: 5.9L Cummins (12V & early 24V)
- Model Years: 1988–2004 Dodge Ram 2500/3500
- Transmissions: Getrag G360 5-speed (1988–1993), NV4500 5-speed (1994–2004), NV5600 Non-HO 6-speed (approx. 1999–2000.5)
- Input Shaft: 1.25" 10-spline. Not for later 1-3/8" (1.375") conversions or NV5600 HO applications.
WHAT'S INCLUDED
- HD diaphragm pressure plate
- 13" full-organic clutch disc (sprung hub)
- Ductile flywheel (with ring gear)
- Pilot bushing, release/throwout bearing, alignment tool, and hardware
CROSS-REFERENCE / ALTERNATIVES
- 13125-OK (400 HP / 800 ft-lbs) – lighter-duty organic option
- 13125-OFEK – organic/feramic single disc for higher heat tolerance
- SDD3250-5 – Street/Tow dual disc for ~650 HP builds (NV4500 & early NV5600 Non-HO)
INSTALL NOTES
- Confirm input shaft size (1.25" 10-spline) before ordering.
- Break-in is critical: follow South Bend’s procedure for best life and engagement quality.
- Inspect hydraulics; older or weak systems can affect release. HD hydraulics recommended on higher-clamp setups.
FAQ
Will this clutch work with my NV5600?It fits Non-HO NV5600 applications (~1999–2000.5) with the 1.25" input. Later HO NV5600 trucks typically require different specs (often 1-3/8" input) and a different kit.
How does pedal feel compare to stock?
The diaphragm pressure plate keeps pedal effort close to stock while adding clamp load and heat capacity for towing and daily use.
Is the flywheel included?
Yes. This kit includes a ductile iron flywheel with ring gear, plus the alignment tool, pilot bushing, and release bearing.
What power can it hold?
It’s commonly rated around 425 HP and ~900 ft-lbs at the crank (truck and usage dependent). For significantly higher power or frequent sled-pull/comp use, consider a dual disc.
Do I need to upgrade to 1-3/8" input?
No for this kit; it’s built for the OE 1.25" 10-spline input. If you’ve already upgraded to 1-3/8", choose a compatible clutch.
