South Bend Dyna Max 13" Upgrade Clutch Kit (13125-OK) – Complete Clutch & Flywheel Kit for 5.9L Cummins

Eliminate premature clutch failure and enjoy smooth, reliable power transfer in your 5.9 Cummins.

The South Bend Dyna Max 13-Inch Upgrade Clutch Kit (part #13125-OK) is the proven solution for 1989–2005 Dodge Ram 5.9L Cummins trucks equipped with 5-speed manual transmissions (Getrag or NV4500) and select early non-HO NV5600 6-speeds. This complete conversion kit upgrades your truck from the factory 12-1/4" clutch to a much stronger and more durable 13" system while retaining the stock 1-1/4" input shaft.

South Bend starts with their robust 13" ETH-style platform and modifies it specifically for your application. The result is a disc center/hub that is 2–3 times stronger than what’s possible in the smaller stock clutches—directly addressing the common failure point (dampener/hub failure) seen in high-horsepower or heavy-towing 5.9 Cummins trucks.

Key Features & Benefits

• Performance Organic Disc — Full-face organic lining on a marcelled (waved) fin with sprung hub delivers smooth, quiet engagement and excellent modulation. Feels like stock but with significantly more holding power.
• Modified Pressure Plate — Increased clamp load for better torque holding while maintaining smooth, driver-friendly pedal feel.
• Complete 13" Conversion Kit — Includes re-drilled and resurfaced flywheel (designed specifically for the larger clutch), performance organic disc, modified pressure plate, release/throwout bearing, alignment tool, pilot bearing, and all hardware.
• Rated Capacity — Up to 400 HP / 800 ft-lbs of torque with approximately 15,000 lb towing capacity (match to your actual power and workload).
• Better Heat Management — Larger 13" diameter and greater friction surface area improve heat dissipation and extend clutch life under load compared to the stock 12-1/4" setup.
• Street & Tow Friendly — Organic material provides quiet operation and comfortable daily drivability without the chatter or harsh engagement of more aggressive materials.

Perfect For

• Daily drivers and work trucks
• Moderate performance builds
• Heavy towing and hauling (when properly matched to power levels)
• Owners tired of replacing slipping or failed stock clutches

Vehicle Fitment

• 1989–1993 Dodge Ram 5.9L Cummins – Getrag 5-speed
• 1994–2004/early 2005 Dodge Ram 5.9L Cummins – NV4500 5-speed
• 1999–2000.5 Dodge Ram 5.9L Cummins non-HO – NV5600 6-speed (with 1-1/4" input shaft)

Note: Not for High Output NV5600 6-speeds or later G56 transmissions. Confirm your transmission and input shaft size before ordering. Many owners also upgrade the hydraulic system (master/slave cylinder) at the same time for best long-term results.