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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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