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I'll offer my thoughts. ~~One thing I noticed when tearing apart was where the drive disc and the sliding drive disc mesh was worn pretty bad.Could this be the cause of my growling noise? No. Once the clutch is engaged and the linings and plates are squeezed together, and the plate with the teeth jiggles into the position up against the driver teeth, there is no rattle. That clutch might rattle because of this when it is disengaged, but not when it is engaged and the pulley is turning. ~~It sounds like its coming from the trans. but I guess it could travel around. Get a stethoscope or at least a length of garden hose and try isolating the noise a few different ways. Is the noise there when the transmission is in neutral and the pulley stopped? That could point to a pulley idler bearing. Noise there when transmission in neutral, pulley spinning? That could be the first reduction gear bearings as well as the counter shaft bearings or the bearing inside the sliding gear shaft drive. There is a bearing quill that is adjustable with shims on the right hand side. Sometimes a noise can be silenced by just re-setting the bearing preloads. Cone bearings are funny like that. Jack both tractor wheels up and operate it in all speeds to see if the transmission is noisy in all gears, or just one gear or a pair of speeds. This could point to a Hi/Lo problem (I don't remember if you have that sort of transmission or not). While the tractor is jacked up, stop one wheel and then the other using the brakes to see if any noises change. This could point towards brake pinion problems (very possible), axle bearings (unlikely), or too loose set differentital bearings (also shim adjustable). I'd take my time and really diagnose whether it's a gear "whine", which you may not cure on a 60 year old machine without looking for some expensive new parts, or bearing growl, which is very different. Old pitted races and rollers growl as they gall up and continue to chew the plating off of each other. Maybe time to drain the rear end oil and look for metal sheen. flakes, and fragments in the oil. You'll know it when you see it. Lots to do before you open it up. Frank
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