Product Description
The Valair NMU70241-01 Heavy Duty Upgrade is a 13.00" x 1.375" single-disc clutch for 1999–2003 Ford F-250/F-350 7.3L Power Stroke with the ZF-6 6-speed. It uses wide organic facings and a high-clamp pressure plate to restore holding power and smooth street/tow drivability.
Fitment
- 1999–2003 Ford F-250/F-350, 7.3L Power Stroke, ZF-6 6-speed manual only
- Will not fit ZF-5 trucks (1994–1998) or automatic transmissions
Power rating: approximately ~400 HP / ~800 ft-lbs (truck dependent). Break in per manufacturer instructions for best life.
What’s Included
- HD organic clutch disc (13.00" x 1.375")
- Pressure plate (Valair HD spec)
- Release bearing, pilot bearing
- Alignment tool
Note: No flywheel included. Inspect your flywheel surface and replace if out of spec.
Recommended Supporting Parts
- South Bend HYDX-F67.3 hydraulic assembly (ZF-6, 1999–2003.5): SOUTH BEND HYDX-F67.3
- Dorman clutch pilot bearing (7.3L): DORMAN 690-083.1
Cross-Reference / Alternatives
- South Bend 1944-6R Single Disc (ZF-6 stock-replacement): 1944-6R
- South Bend 1944-6OR Single Disc (ZF-6, ~400HP): 1944-6OR
- South Bend 1944-6OR-HD Single Disc (ZF-6, ~425HP/900TQ): 1944-6OR-HD
- For ZF-5 (1994–1998) trucks, see South Bend ZF-5 options: 1944-5OFEK
FAQ
What power and torque will this hold?It’s commonly listed around ~400 HP / ~800 ft-lbs in a healthy setup. If you’re planning over this, consider the South Bend 1944-6OR-HD or a dual-disc solution.
Does this include a flywheel?No. This kit includes the disc, pressure plate, release bearing, pilot bearing, and alignment tool. Resurface or replace your flywheel as needed.
ZF-6 vs ZF-5—how do I know which I have?1999–2003 Power Stroke trucks with a manual are typically ZF-6. Earlier 1994–1998 trucks are ZF-5. Check the transmission tag on the case to confirm.
