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Yes I realize that, just as was stated before I could get back here, there is a vastly different additive package. Like was mentioned, run what you want. I just prefer the gear oil, and I run Lucas in mine on top of that, which may or may not be the only reason mine hasn't had any bearing or...

Because lubrication technology has vastly improved since 1949, and parts are getting more scarce for these by the day. The newer lube order calls for 80/90 anyway.

But for how long? How much have you ran it that way? These transmissions were barely heavy duty enough to stay in one piece in our trucks from the beginning, I certainly have some reservations about using an even lighter oil in an already stressed transmission. I'm sure it works fine for those...

80/w90 GL-1 gear oil for axles, trans, transfer case, steering box, and winch. Make sure you change the oil in both sides of the winch.