Is this the truck clutch? 11inch?
Centerforce Dual Friction Clutches DF070800 $394.95
http://www.summitracing.com/parts/ctf-df070800
Manufacturer's Part Number

F070800
Centerforce Dual Friction Clutches
Summit Racing Part Number:CTF-DF070800
UPC:788442016284
Input Spline Quantity:23
Input Shaft Diameter:1.000 in.
Disc Diameter (in):11.000 in.
Disc Diameter (mm):279mm
Disc Material:Organic/Carbon composite
Disc Style:Sprung hub
Pressure Plate Style

iaphragm
Counterweight Assist:Yes
Notes:Must be used with
143 tooth flywheel (big block??) with 11 inch pressure plate bolt pattern. Not compatible with 10.5 inch or 10.95 inch pressure plate bolt patterns.
Centerforce Dual Friction clutches generate up to a 90 percent increase in holding capacity over stock systems. These clutch-and-disc sets are designed for engines producing high horsepower and big torque outputs. Perfect for 4WD vehicles, all Centerforce clutch systems provide smooth engagement and light pedal pressure without compromising high performance.
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http://www.summitracing.com/parts/mcl-75108 $230.00
http://www.summitracing.com/parts/mcl-75108
Manufacturer's Part Number:75108
Part Type:Clutch Kits
Product Line:McLeod StreetPro Clutch Kits
Summit Racing Part Number:MCL-75108
Input Spline Quantity:23
Input Shaft Diameter:1.000 in.
Disc Diameter (in):11.000 in.
Disc Diameter (mm):279mm
Disc Material:Organic
Disc Style:Sprung hub
Pressure Plate Style

iaphragm
McLeod StreetPro clutch kits are excellent performance clutches for street enthusiasts. StreetPro clutches are ideal for use with basic engine modifications, including cold-air intakes, exhaust upgrades, and engine management programming. StreetPro clutches provide slightly heavier pedal effort with increased holding capacity, making them excellent factory replacement performance clutches.
* Bolt to stock flywheels
* Handle up to 350 hp
* Organic disc facing for smooth engagement with excellent release qualities
* Kits include a pressure plate, disc, throwout bearing (unless specified otherwise), and alignment tool