Price is 100 each shaft set, or 175 for the pair. Drive shafts came from a fresh water only cruiser boat with twin 225 hp Chrysler 318s. They look to be clean and straight with no pits. Threads are both clean and not gauled. Each shaft set comes with the brass stuffing box and 4 bolt flange. If your driveshaft is shorter, these can easily be cut down in length, but you'd need to have a new keyway cut for the flange. Depending on the horsepower of your engine, you could "get by" I guess by grinding a flat or drill detent holes where the set screws lock the flange. On a sailboat engine under 50 hp, no problem, but for a V-8 I'd find a machine shop to cut a new keyway if you have to shorten it. 57 1/4" measurement is from absolute end of shaft to opposite end of shaft. I believe the thread size is a 3/4-10.
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