South Bend Clutch has a nice heavy clutch for these IDI's and a SMF kit as well. I have one on my F250 and I'll be getting another for my F350 crew cab when I do the C6 to ZF5 swap.
I'll second the SBC - Peter up there warranted a clutch that the previous owner purchased for my truck. I didn't ask him to cover it under warranty but he did - WOW! what great customer service. All I did was call him and start asking if I had the right clutch and what the situation was, Peter stepped right up and said I'll cover parts, and if this level of clutch doesn't work out then we will step you up to the next level. Again you can't ask for more.
I couldn't decide on who to go with, but I eventually ended up getting the South bend solid flywheel conversion kit (part number 1944325K) for the C6/ZF5 swap I am working on.
I haven't put it in yet, but they did have good customer service, and the shipment was early!
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