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7.3 Powerstroke 400 HP Ceramic/Kevlar Clutch Kit – South Bend 1939DF (ZF6)
Upgrade your 1999–2003 Ford 7.3L Powerstroke with the South Bend 1939DF Spicer-Design Ceramic/Kevlar Clutch Kit. This Stage 2 single-disc clutch is built for modified 7.3L trucks that need reliable power transfer whether you're towing heavy loads, daily driving, or running performance upgrades.
Rated for 400 horsepower and 800 ft-lbs of torque, the 1939DF uses a proven 4-paddle free-travel sprung hub design that has been trusted in semi-truck applications for over 20 years. The dual-friction disc combines Kevlar on the pressure plate side for smooth engagement and long life with ceramic buttons on the flywheel side for superior holding power and heat resistance.
Why the South Bend 1939DF Stands Out
- Vibration damping — Specifically engineered to absorb the harsh vibrations of the 7.3L diesel, reducing stress on the drivetrain.
- Eliminates common OEM failures — Replaces the problematic Valeo disc that is prone to throwing damper springs under load.
- Works with your existing OEM solid flywheel — No need to buy a new flywheel (resurface your current one for best results).
- Upgraded pilot bearing — Includes a durable roller-style pilot bearing that replaces the failure-prone OEM needle bearing.
- Street-friendly performance — Strong lock-up with smoother engagement than aggressive ceramic-only clutches.
Kit Includes
- Ceramic/Kevlar dual-friction clutch disc (13", 10-spline, 1.375" input shaft)
- Modified diaphragm pressure plate
- Throwout bearing
- Pilot bearing (roller style)
- Clutch alignment tool
Note: Flywheel is not included. This kit is designed for use with your factory solid flywheel only.
Vehicle Fitment
- 1999–2003 Ford 7.3L Powerstroke with ZF6 6-speed manual transmission
- Direct bolt-in for trucks with the factory solid flywheel
Recommended Use
Perfect for daily driven or work trucks with moderate power upgrades and towing needs up to the rated capacity. For best longevity, perform a proper 500-mile break-in period with stop-and-go driving before heavy towing, and avoid unnecessary downshifting.
This is the go-to clutch upgrade for 7.3L owners who want a durable, streetable clutch that can handle real-world torque without the harshness of a full-ceramic race disc.
7.3 Powerstroke 400 HP Ceramic/Kevlar Clutch Kit – South Bend 1939DF (ZF6)
Upgrade your 1999–2003 Ford 7.3L Powerstroke with the South Bend 1939DF Spicer-Design Ceramic/Kevlar Clutch Kit. This Stage 2 single-disc clutch is built for modified 7.3L trucks that need reliable power transfer whether you're towing heavy loads, daily driving, or running performance upgrades.
Rated for 400 horsepower and 800 ft-lbs of torque, the 1939DF uses a proven 4-paddle free-travel sprung hub design that has been trusted in semi-truck applications for over 20 years. The dual-friction disc combines Kevlar on the pressure plate side for smooth engagement and long life with ceramic buttons on the flywheel side for superior holding power and heat resistance.
Why the South Bend 1939DF Stands Out
Vibration damping — Specifically engineered to absorb the harsh vibrations of the 7.3L diesel, reducing stress on the drivetrain.
Eliminates common OEM failures — Replaces the problematic Valeo disc that is prone to throwing damper springs under load.
Works with your existing OEM solid flywheel — No need to buy a new flywheel (resurface your current one[...]
7.3 Powerstroke 400 HP Ceramic/Kevlar Clutch Kit – South Bend 1939DF (ZF6)
Upgrade your 1999–2003 Ford 7.3L Powerstroke with the South Bend 1939DF Spicer-Design Ceramic/Kevlar Clutch Kit. This Stage 2 single-disc clutch is built for modified 7.3L trucks that need reliable power transfer whether you're towing heavy loads, daily driving, or running performance upgrades.
Rated for 400 horsepower and 800 ft-lbs of torque, the 1939DF uses a proven 4-paddle free-travel sprung hub design that has been trusted in semi-truck applications for over 20 years. The dual-friction disc combines Kevlar on the pressure plate side for smooth engagement and long life with ceramic buttons on the flywheel side for superior holding power and heat resistance.
Why the South Bend 1939DF Stands Out
- Vibration damping — Specifically engineered to absorb the harsh vibrations of the 7.3L diesel, reducing stress on the drivetrain.
- Eliminates common OEM failures — Replaces the problematic Valeo disc that is prone to throwing damper springs under load.
- Works with your existing OEM solid flywheel — No need to buy a new flywheel (resurface your current one for best results).
- Upgraded pilot bearing — Includes a durable roller-style pilot bearing that replaces the failure-prone OEM needle bearing.
- Street-friendly performance — Strong lock-up with smoother engagement than aggressive ceramic-only clutches.
Kit Includes
- Ceramic/Kevlar dual-friction clutch disc (13", 10-spline, 1.375" input shaft)
- Modified diaphragm pressure plate
- Throwout bearing
- Pilot bearing (roller style)
- Clutch alignment tool
Note: Flywheel is not included. This kit is designed for use with your factory solid flywheel only.
Vehicle Fitment
- 1999–2003 Ford 7.3L Powerstroke with ZF6 6-speed manual transmission
- Direct bolt-in for trucks with the factory solid flywheel
Recommended Use
Perfect for daily driven or work trucks with moderate power upgrades and towing needs up to the rated capacity. For best longevity, perform a proper 500-mile break-in period with stop-and-go driving before heavy towing, and avoid unnecessary downshifting.
This is the go-to clutch upgrade for 7.3L owners who want a durable, streetable clutch that can handle real-world torque without the harshness of a full-ceramic race disc.
Fits: Powerstroke 1999-2010