Upgrade the weak factory clutch in your 2004-2007 Ford F-250/F-350/F-450/F-550 6.0L Power Stroke equipped with the ZF6 6-Speed manual transmission using the South Bend 1950-60DFK kevlar/ceramic dual-friction single disc clutch kit. Engineered specifically for this engine and transmission combination, this kit delivers smoother engagement, far better holding power, and long-term durability over the original setup.
This complete kit ships with a heavy-duty South Bend flywheel, so you can ditch the weak factory dual-mass flywheel in the same install. Rated for approximately 400 hp - 425 hp (sources vary slightly, 400 hp common for DFK), 800 - 900 ft-lbs (sources vary, 800 ft-lbs most common for DFK), 20,000 - 25,000 lbs towing.
The South Bend 1950-60DFK is a kevlar/ceramic dual-friction single disc clutch kit built specifically for 2004-2007 Ford F-250/F-350/F-450/F-550 trucks running the 6.0L Power Stroke engine paired with the ZF6 6-Speed manual transmission. This is one of the most critical fitment details on these trucks - the same year and engine combination was offered with multiple transmissions, so always confirm your transmission code before ordering.
The ceramic friction material is built for serious holding power on heavily tuned trucks and aggressive performance use. The Kevlar/Ceramic dual friction setup is purpose-built for high-torque applications that need maximum grab without destroying drivability. The sprung hub design absorbs drivetrain shock at engagement and protects your transmission and driveline from harsh take-offs.
| Year Range | 2004-2007 |
|---|---|
| Make / Model | Ford F-250/F-350/F-450/F-550 |
| Engine | 6.0L Power Stroke |
| Transmission | ZF6 6-Speed Manual (specifically fits S6-750) |
| Disc Type | Single Disc |
| Disc Material | Kevlar/Ceramic Dual-Friction |
| Disc Size | 13\" (330mm) |
| Hub Style | Sprung Hub |
| Flywheel Included | Yes (includes Solid Mass Flywheel PN 1670406-60) |
| Hydraulics Included | No |
| HP Rating | 400 hp - 425 hp (sources vary slightly, 400 hp common for DFK) |
| Torque Rating | 800 - 900 ft-lbs (sources vary, 800 ft-lbs most common for DFK) |
| Towing Capacity | 20,000 - 25,000 lbs |
| Recommended Use | Daily Driver / Towing / Moderate Performance (not recommended for stock) |
This kit is for 2003-2007 Ford Super Duty 6.0L Power Stroke trucks with the ZF6 (ZF S6-650) 6-Speed manual transmission only. If you have the 2008-2010 6.4L Power Stroke, you need the 1950-64 series.
This kit is a Dual Friction (DF) design using 4 ceramic buttons and 4 Kevlar buttons. It is intended to replace the factory dual mass flywheel with a solid mass flywheel. Not recommended for stock applications. Requires 500-mile break-in period. For Ford Broncos/F-Series with 6.0L swap/fitment.
If you are seeing any of these symptoms, replace the clutch before further transmission or driveline damage occurs.
1-year / 12,000 mile (Manufacturer defects only) from the date of purchase, covering manufacturing defects in materials and workmanship. Applies to the original purchaser only. Proper installation, break-in, and flywheel resurfacing (when reusing a flywheel) are required for warranty validity. For exact terms refer to South Bend Clutch's current warranty policy at time of purchase.
Q: What trucks does the 1950-60DFK fit?
A: This kit is designed for 2004-2007 Ford F-250/F-350/F-450/F-550 with the 6.0L Power Stroke engine and ZF6 6-Speed manual transmission. See the application notes above if your year/engine combination came with more than one transmission.
Q: How much power and towing can it handle?
A: South Bend rates this kit for approximately 400 hp - 425 hp (sources vary slightly, 400 hp common for DFK), 800 - 900 ft-lbs (sources vary, 800 ft-lbs most common for DFK), 20,000 - 25,000 lbs towing. Real-world capacity depends on driving style, tune, and supporting modifications.
Q: Do I need to buy a flywheel separately?
A: No - this kit includes a brand-new South Bend solid-mass flywheel sized and machined for this clutch.
Q: Is this clutch OK for daily driving?
A: Yes - the disc material and pressure plate are tuned for street-friendly engagement and reasonable pedal effort. Aggressive race-style clutches usually carry the ceramic or full-face puck designation; this kit is built for daily use, towing, and mild performance.
Q: What is the recommended break-in period?
A: South Bend typically recommends 500-1,000 miles of easy, mixed driving with no hard launches or heavy towing so the friction surfaces properly seat. Skipping the break-in can void your warranty.
Q: Do I need anything else to install it?
A: We strongly recommend inspecting and replacing the hydraulic master and slave cylinders, pilot bearing, and checking the throwout bearing fork at the same time. Always use the alignment tool included in the kit. If you are reusing a flywheel, it must be properly resurfaced.
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