A lot depends on the construction of the gear box. If it is packed with grease from the factory, it probably is not designed to hold liquid oil.
Does it have lip type seals on the shafts? Are the mating surfaces machined and gasketed? Are there threaded plugs for adding oil? If so, it should hold oil, something like 90w or 140w.
But if the shafts don't have seals, or the seals are more for keeping dirt out than oil in, it won't hold oil. If the housing is not machined where the cover bolts on, or the cases bolt together, probably won't hold oil. In this case, corn head might work. It would be more likely to lube the gears than gun grease that tends to sling and migrate away from where it's needed most. It's your call, if you will be the one using it, and are willing to experiment, might give it a try, just keep an eye on it, see how it does as for leaking or overheating.
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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