In Reply to: parts book posted by silverbean on June 25, 2009 at 14:36:52:
Likely an IH harvester box. Might have best luck checking for info or a rebuilt box from them guys. I would dare bet backwards threads because I would think the top side of belt is doing the pulling and if normal threads it would spin the pulley off over time. Guessing a little for there was only a couple flex heads in this area back then and I know if they had the wobble box drive they were purchased from IH. Good luck