I had this '75 Raider 10 trans lying about. So this morning, being at a loose end, I decided to check it out. First thing first, check the oil. No dipstick of course so stuck a rod down the filler/level hole. Nothing! Dry as a bone. Also nothing would turn. Drive shafts or pulley that was still on. Pulley can off quite easily with the aid of a 3 leg pulley. Much to my surprise.
Next split the cases. They took a bit of persuading to part, but eventually did so. What a mess.
Every bearing is seized. As I most likely never use it, I don't think it's worth replacing them and rebuilding cost wise.