Like I said, I had a 6.0, and a dirty little secret that most clutch manufacturers don't let be known but the the at South Bend
did, is that because the 6.0 uses a self adjusting pressure plate, modifying it is complicated and can make the pressure plate junk if done wrong, so they use a stock pressure plate in their single disc kits for the 6.0, or at least that was the case in 2008. So I had a single disc (stock pressure plate) with their CB - Ceramic Button disc. Torque holding capacity was excellent with that disc. It would squak on occasion, and chattered a bit when cold, but it had no problem holding power or towing at up to 22,000lbs gross combined.
That being said, their website is pretty basic. You can browse their offerings on their website. http://www.southbendclutch.com/1944ps5.html
I'd suggest you be honest with yourself for power level and intended use, don't get "too much" clutch for your application. A heavy duty full organic clutch should be fine for an OBS 7.3 with a chip, an exhaust, and an air intake/6637 setup, running stock sticks and turbo.
The final thing to note is the truck's gear ratio and tire size will change the ability of the clutch. So basically, a 3.55 gear is harder on the clutch than a 4.10 gear, and a 30" tire is easier on the clutch than a 33" tire. In my case, I had 3.73 gears and. 35" tires, so I needed a clutch with more torque capacity than the stock clutch could handle running a tow tune that made 50hp/150tq more than stock.
Now, there is one more thing, Kevlar might make a fantastic bullet proof
vest, but it's a terrible clutch facing material. Organic facings, including asbestos (yes it's still available and why you still shouldn't use compressed air to blow out bell housings or clutches) will provide the smoothest engagement and longest life when matched to the application and used with the correct clamp force from the pressure plate.
The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan
7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4
6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4
6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift