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I have been through this movie several times with a C and two supers. There are two different types of bull gear. If you have the one that is a solid steel gear, it will last through several axles, even if the ends of the splines are a little damaged. If you have one with a steel rim riveted onto a cast iron hub, you will eventually take the splines out of it. The axles are a weak point in the C, Super C, 200, etc. I have not had as much trouble since I stopped plowing snow with the C. I think that the constant shuttling between forward and reverse, with chains on and heavy ballast, is really rough on the axles. I have always used the old gasket on the PTO housing, and bought new for the axle housing and the deck. I use just a thin smear of silicone to hold the gaskets in place for installation. You should also use non hardening sealer of some kind on the bolts that hold down the cover. Otherwise the specially designed IH water funneling bolt holes will add rainwater to your transmission oil. I don't know if IH ever gave a spec for the torques, but the deck and PTO aren't really critical, just tighten them up with a ratchet. The axle housing should be tightened just as hard as you can without getting stupid, and recheck it after a couple day's use. I don't have one handy, but there are generic torque charts available, with the torque based on the size and grade of the bolt. One of those will get you close enough, and is useful for other things as well.
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