Upgrade the weak factory clutch in your 1999-2003.5 Ford F-250/F-350/F-450/F-550 Super Duty 7.3L Power Stroke equipped with the ZF6 6-Speed manual transmission using the South Bend 1944-6OK organic 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, 800 ft-lbs, 15,000 lbs towing.
The South Bend 1944-6OK is a organic single disc clutch kit built specifically for 1999-2003.5 Ford F-250/F-350/F-450/F-550 Super Duty trucks running the 7.3L 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 organic friction lining gives you smooth, street-friendly engagement and excellent heat resistance for towing and daily driving. The sprung hub design absorbs drivetrain shock at engagement and protects your transmission and driveline from harsh take-offs.
| Year Range | 1999-2003.5 |
|---|---|
| Make / Model | Ford F-250/F-350/F-450/F-550 Super Duty |
| Engine | 7.3L Power Stroke |
| Transmission | ZF6 6-Speed (ZF S6-650) |
| Disc Type | Single Disc |
| Disc Material | Organic |
| Disc Size | 13" |
| Hub Style | Sprung hub |
| Flywheel Included | Yes (Includes solid mass flywheel) |
| Hydraulics Included | No |
| HP Rating | 400 hp |
| Torque Rating | 800 ft-lbs |
| Towing Capacity | 15,000 lbs |
| Recommended Use | Daily driver, Street/Tow |
The 1944-6 series fits only the 1999-2003.5 7.3L Power Stroke with the ZF6 (ZF S6-650) 6-Speed manual. If your 1999-2003 truck has the ZF5 5-Speed, you need a 1944-5 series kit instead. If your truck has an automatic (E4OD, 4R100), this kit is not for you.
Will not work with OEM flywheel; requires the included South Bend flywheel. Some sources list HP/Torque as 350hp/750lb-ft or 375hp/800lb-ft, but official manufacturer data confirms 400hp/800lb-ft.
If you are seeing any of these symptoms, replace the clutch before further transmission or driveline damage occurs.
12-month / 12,000-mile 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 1944-6OK fit?
A: This kit is designed for 1999-2003.5 Ford F-250/F-350/F-450/F-550 Super Duty with the 7.3L 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, 800 ft-lbs, 15,000 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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