Hey all, I've got a '91-up Evo style S&S, and the 4-speed and primary drive parts from an '81 superglide. Don't have the primary cases though. Do any of you know if it's possible to make this combo work? I'm mainly concerned about the engine/tranny. It's all going into a rigid frame, and mods to the frame I can do. I just need some info on what primary set-up I can use. ??