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Diesel Performance Clutch Specialists
Power Stroke Clutch Kits & Performance Upgrades
South Bend Clutch offers heavy-duty clutch solutions for Ford Power Stroke diesel trucks. From the legendary 7.3L to the compound-turbo 6.4L, we have clutches rated from stock replacement to 1,500+ horsepower.
24+
Years Building Diesel Clutches
1,500+
HP Capacity Available
100%
Made in USA
12/12K
Warranty Coverage
Performance Clutches for Ford Power Stroke Diesels
Ford's Power Stroke diesel engines have earned a devoted following among truck enthusiasts. From the bulletproof 7.3L to the factory twin-turbo 6.4L, these engines deliver the torque that diesel lovers crave—and that torque demands a clutch built to handle it.
The ZF5 and ZF6 manual transmissions found in Power Stroke trucks are excellent platforms for performance builds. But the factory clutch becomes the weak link once you start adding power. That's where South Bend Clutch comes in.
We've been building Power Stroke clutches since the 7.3L era. We understand what these engines need and offer clutch solutions from stock replacement to full competition.
- Complete coverage for ZF5 and ZF6 transmissions
- Clutch kits rated from 400 to 1,500+ HP
- Organic, ceramic, and hybrid friction options
- Street-friendly dual disc kits
- Complete kits with all hardware included
- Technical support from diesel experts
The Legend
7.3L Power Stroke (1994-2003)
The Most Reliable Diesel Ford Ever Made
The 7.3L Power Stroke is universally regarded as the most reliable diesel engine Ford has ever produced. Designed by International/Navistar, the 7.3L combined massive displacement with simple, mechanical-style reliability despite being electronically controlled. Many of these trucks are still on the road with 400,000+ miles on the original engine.
From the factory, the 7.3L produced 210-275 horsepower depending on year and tune. While modest by modern standards, the 7.3L responds extremely well to modifications. Injectors, turbo upgrades, and tuning can push these engines well past 500 horsepower while maintaining daily-driver reliability.
Manual Transmission Options
The 7.3L was available with the ZF5 5-speed manual (1994-1997) and ZF6 6-speed manual (1999-2003). Both are excellent transmissions, but the ZF6 is preferred for high-power builds due to its stronger internals and better gear ratios. South Bend offers clutches for both applications.
7.3L Specifications
- Displacement 7.3L (444 ci)
- Configuration V8 Turbodiesel
- Injection HEUI
- Stock HP 210-275 HP
- Stock Torque 425-525 lb-ft
- Trans Options ZF5, ZF6
- Tuning Potential 400-700+ HP
Troubled Child
6.0L Power Stroke (2003-2007)
Powerful But Problematic
The 6.0L Power Stroke replaced the beloved 7.3L with a more powerful but significantly less reliable engine. Known issues include head gasket failures, EGR problems, injector stiction, FICM failures, and oil cooler clogging. A "bulletproofed" 6.0L with ARP head studs, EGR delete, and oil cooler upgrade can be a reliable performer, but the work isn't cheap.
When properly sorted, the 6.0L offers impressive power potential. The factory 325 horsepower can easily be pushed to 500+ horsepower with tuning, injectors, and turbo work. The engine's HEUI injection system responds well to modifications.
Transmission Options
The 6.0L was available with both the 5R110W TorqShift automatic and ZF6 6-speed manual. The ZF6 is highly desirable and commands premium prices. South Bend's ZF6 clutch kits ensure your clutch can handle whatever power your bulletproofed 6.0L produces.
6.0L Specifications
- Displacement 6.0L (365 ci)
- Configuration V8 Turbodiesel
- Injection HEUI
- Stock HP 325 HP
- Stock Torque 570 lb-ft
- Trans Options 5R110W, ZF6
- Tuning Potential 450-700+ HP
Compound King
6.4L Power Stroke (2008-2010)
Factory Compound Turbos
The 6.4L Power Stroke was Ford's first diesel with factory compound turbochargers and the first with a diesel particulate filter (DPF). It addressed many of the 6.0L's reliability issues but introduced new ones. The DPF system was problematic, leading most enthusiasts to delete it, and the compound turbos can be expensive to replace.
The 6.4L produced 350 horsepower and 650 lb-ft of torque from the factory—impressive numbers for its time. With the DPF deleted and proper tuning, 500+ horsepower is easily achievable. The compound turbo setup spools quickly and makes excellent power across the RPM range.
Manual Option
The 6.4L was available with the ZF6 6-speed manual, making it popular with enthusiasts who prefer three pedals. South Bend offers complete clutch kits for 6.4L ZF6 trucks rated from stock replacement to competition use.
6.4L Specifications
- Displacement 6.4L (390 ci)
- Configuration V8 Twin Turbo
- Injection Common Rail
- Stock HP 350 HP
- Stock Torque 650 lb-ft
- Trans Options 5R110W, ZF6
- Tuning Potential 500-900+ HP
Modern Workhorse
6.7L Power Stroke (2011-Present)
Ford's In-House Diesel
The 6.7L Power Stroke marked Ford's first in-house diesel engine design, ending the partnership with International/Navistar. The result is an incredibly capable engine producing up to 475 horsepower and 1,050 lb-ft of torque in the latest versions—numbers that would have seemed impossible just a decade ago.
The 6.7L features a unique reverse-flow layout with the turbo positioned in the engine valley and exhaust manifolds on top. This design improves packaging and reduces turbo lag. The engine is very robust, with many owners reporting trouble-free operation well past 200,000 miles.
No Manual Option
Unfortunately, Ford never offered a manual transmission option with the 6.7L Power Stroke. All trucks came with the 6R140 TorqShift automatic. Manual swap options are limited and complex due to the engine's electronic integration.
6.7L Specifications
- Displacement 6.7L (406 ci)
- Configuration V8 Turbodiesel
- Injection Common Rail
- Stock HP 440-475 HP
- Stock Torque 925-1,050 lb-ft
- Transmission 6R140 Auto
- Tuning Potential 600-1,000+ HP
Power Stroke Manual Transmissions
South Bend offers clutches for both ZF5 and ZF6 equipped trucks
ZF5
1994-1997
The ZF S5-42 5-speed manual was standard equipment in 7.3L trucks from 1994-1997. It's a reliable transmission but limited in power handling compared to the later ZF6. Best suited for stock to moderately modified trucks.
- Clutch Size 12.25 Inch
- Input Spline 10-Spline
- Torque Rating 450 lb-ft (stock)
- Max HP (w/ SBC) 500 HP
- Best For Stock-mild builds
ZF6
1999-2010
The ZF S6-650 6-speed manual is the preferred choice for high-power Power Stroke builds. Found in 7.3L (1999-2003), 6.0L, and 6.4L trucks, the ZF6 offers excellent strength and smooth shifts. Highly sought-after by enthusiasts.
- Clutch Size 13 Inch
- Input Spline 10-Spline
- Torque Rating 650 lb-ft (stock)
- Max HP (w/ SBC) 1,200+ HP
- Best For High HP builds, towing
Power Stroke Clutch Application Guide
Find the right clutch for your Power Stroke based on engine, transmission, and power level
| Year Range | Vehicle | Engine | Transmission | Power Level | Recommended Clutch |
|---|---|---|---|---|---|
| 1994-1997 | Ford F250/F350 | 7.3L Power Stroke | ZF5 | Stock-400 HP | ZF5-OK-HD |
| 1999-2003 | Ford F250/F350 | 7.3L Power Stroke | ZF6 | Stock-500 HP | ZF6-OK-HD |
| 1999-2003 | Ford F250/F350 | 7.3L Power Stroke | ZF6 | 500-750 HP | ZF6 Dual Disc |
| 2003-2007 | Ford F250/F350 | 6.0L Power Stroke | ZF6 | Stock-500 HP | ZF6-OK-HD |
| 2003-2007 | Ford F250/F350 | 6.0L Power Stroke | ZF6 | 500-800 HP | ZF6 Dual Disc |
| 2008-2010 | Ford F250/F350 | 6.4L Power Stroke | ZF6 | Stock-550 HP | ZF6-OK-HD |
| 2008-2010 | Ford F250/F350 | 6.4L Power Stroke | ZF6 | 550-900 HP | ZF6 Dual Disc |
| 2008-2010 | Ford F250/F350 | 6.4L Power Stroke | ZF6 | 900+ HP | ZF6 Triple Disc |
Which Clutch Is Right for Your Power Stroke?
Match your clutch to your power level and usage
Daily Driver
Stage 2 Single Disc
Stock to 500 HP / 900 lb-ft
Perfect for stock or mildly modified Power Stroke trucks. OEM-like pedal feel with greatly increased torque capacity for towing and daily driving.
- Smooth, stock-like engagement
- Organic friction material
- Direct bolt-in replacement
- 100,000+ mile service life
- Excellent for towing
- Complete kit with hardware
Performance
Dual Disc Clutch
450 to 900 HP / 1,400 lb-ft
The choice for serious Power Stroke performance. Dual-disc design provides excellent holding power and heat capacity for tuned trucks.
- Doubled friction surface area
- Superior heat management
- Ceramic or organic options
- Manageable pedal effort
- Heavy towing capable
- Billet flywheel included
Competition
Triple Disc Clutch
800 to 1,500+ HP
Maximum torque capacity for sled pulling and competition Power Stroke builds. Three friction discs ensure your clutch is never the weak link.
- Highest torque capacity
- Triple friction surfaces
- Competition ceramic material
- All billet construction
- SFI certified
- Pro-level durability
Why Power Stroke Owners Choose South Bend
The trusted name in diesel performance clutches
Power Stroke Experts
We've been building clutches for Power Stroke trucks since the 7.3L era. We understand what these engines need to put power to the ground reliably.
Made in USA
Every South Bend Clutch is manufactured in Fort Wayne, Indiana. We're proud to build American clutches for American trucks.
ZF5 & ZF6 Coverage
Complete clutch solutions for both ZF5 and ZF6 manual transmissions across all Power Stroke generations.
Complete Kits
Every kit includes clutch disc, pressure plate, bearings, and alignment tool. No extra parts needed.
Power Stroke Clutch FAQs
Common questions about Power Stroke clutches and upgrades
Which Power Stroke generation is best?
Each generation has its strengths:
- 7.3L: Most reliable, simple to work on, legendary durability. Lower power ceiling but bulletproof.
- 6.0L: Good power potential but requires "bulletproofing" to be reliable. Can be a great engine once sorted.
- 6.4L: Factory compound turbos make good power. Delete the emissions equipment and it's a solid performer.
- 6.7L: Most powerful and capable, but no manual option. Very reliable from the factory.
For a manual transmission truck, the 7.3L ZF6 trucks (1999-2003) and 6.4L ZF6 trucks (2008-2010) are the most desirable.
What's the difference between ZF5 and ZF6 clutches?
The ZF5 and ZF6 use different clutch sizes:
- ZF5 (1994-1997): 12.25" clutch diameter, lighter-duty design, rated for ~450 lb-ft stock
- ZF6 (1999-2010): 13" clutch diameter, heavier-duty internals, rated for 650+ lb-ft
The ZF6 is the preferred transmission for high-power builds due to its larger clutch and stronger gear set. If you're planning significant power modifications, the ZF6 is the better platform.
Can I swap a ZF6 into an older Power Stroke?
Yes, ZF6 swaps into earlier 7.3L trucks are a popular upgrade. The ZF6 from 1999+ trucks can be swapped into 1994-1998 trucks with:
- Different bellhousing or adapter
- Updated clutch hydraulics
- Driveshaft modifications
- Crossmember adjustments
This swap gives older trucks the stronger ZF6 transmission and larger 13" clutch capacity. South Bend clutch kits work with these swap setups.
How much power can a ZF6 handle?
The ZF6 is a robust transmission that can handle significant power:
- Stock ZF6: Reliable to 600-650 HP with quality clutch
- Built ZF6: Input shaft upgrade extends capacity to 1,000+ HP
- Full Build: Gears, syncros, and input shaft can handle 1,500+ HP
The clutch is often the first upgrade needed. South Bend's dual and triple disc options are rated well beyond what even a built ZF6 can handle.
Do you offer clutches for the 6.7L Power Stroke?
The 6.7L Power Stroke was never offered with a manual transmission from the factory. All 6.7L trucks came with the 6R140 TorqShift automatic transmission.
Manual swaps into 6.7L trucks are theoretically possible but extremely complex due to:
- Electronic integration with the engine computer
- Lack of factory clutch hydraulic provisions
- Custom adapter plate requirements
Most 6.7L owners seeking manual transmission options either build a different platform or focus on upgrading their automatic transmission.
What's the break-in procedure for a new clutch?
Proper break-in is essential for clutch longevity:
- First 500 Miles: Gentle driving only—no heavy loads, no aggressive acceleration, no towing
- Avoid Slipping: Don't ride the clutch or slip it excessively during break-in
- Vary RPM: Use different engine speeds to seat the friction surfaces evenly
- Cool Down: If you notice any smell or heat, let the clutch cool before continuing
After 500 miles of proper break-in, your South Bend clutch will be fully seated and ready for normal use, including towing and performance driving.
Ready to Upgrade Your Power Stroke?
Find the perfect clutch for your truck or talk to our diesel experts.
Questions? Email us at sales@southbendclutch.com