SOUTH BEND 1944-6K STOCK CLUTCH KIT – 1999–2003 FORD 7.3L POWERSTROKE ZF-6

OEM-feel, South Bend durability. The 1944-6K is a 13" full-organic single-disc clutch with a South Bend single-mass flywheel and Kevlar pilot bushing. It’s designed for stock power trucks that tow and daily-drive, delivering smooth engagement and consistent holding power without harshness.

• Disc: 13" full-organic (single disc)
• Pressure Plate: Diaphragm style for lighter pedal feel
• Flywheel: Includes South Bend single-mass flywheel (replaces OEM dual-mass)
• Pilot Bushing: Kevlar
• Intended Use: Stock HP/torque, daily driving & towing

FITMENT

• Engine: 7.3L Powerstroke
• Model Years: 1999–2003 (1999–2003.5 production range)
• Trans: ZF-6 manual (6-speed)
• Vehicles: Ford F-250 / F-350 / F-450 / F-550 Super Duty
• Input/Spline: 10-spline, 1.375" input shaft (ZF-6)

WHAT’S INCLUDED

• South Bend diaphragm pressure plate
• 13" full-organic clutch disc
• South Bend single-mass flywheel
• Kits/Hardware: release (throwout) bearing, Kevlar pilot bushing, alignment tool, mounting hardware

CROSS-REFERENCE / ALTERNATIVES

• 1944-6OR (HD Organic, no flywheel) – for mild towing/performance with existing SMF
• 1944-6OK (Organic/Kevlar) – added durability for frequent towing
• 1944-6OFEK (Organic/Feramic with flywheel) – ~475 HP / ~1000 ft-lbs capacity for tuned trucks

INSTALL NOTES

• This kit converts OEM dual-mass to single-mass flywheel.
• Inspect hydraulics and release fork; replace if worn to ensure proper release.
• Follow South Bend break-in procedure for best life and smoothness.

FAQ

No. This kit includes a South Bend single-mass flywheel and replaces the OEM dual-mass assembly.

Pedal effort is comparable to stock thanks to the diaphragm pressure plate, with smooth take-up for daily driving and towing.

ZF-6 10-spline, 1.375" input shaft used on 1999–2003 7.3L Super Duty trucks.

Not required on a healthy system, but replacing aging hydraulics during a clutch job is recommended for best release and feel.