So I am doing the ZF5 swap. I need some advice on a clutch to go with..I will be buying it all with solid flywheel. Look at my mods and see what you think. I will tow a fair amount 3-5k 1 day a week @ 200 miles. 11k a couple of times a year...rarely more. My research for "best fit" for what I want has me pointing to a South Bend heavy duty organic #1944-5OKHD. Rated @ 425hp and 800tq. I really don't want to spend $825 if I don't have to. I also have looked at the valair stock one rated @ 375 and 850 # NMU70263 and $530. I have heard good things about that valair...but it might not be enough. Mixed on South bend but nothing on the heavy duty version of the organic. What about Luk? I have an extremely long steep driveway that I will be backing these trailers up and will have to do it in 4lo. I don't race, sled pull or anything. Goal is to get 70k miles or more out of it...I can live with that.