I used to assume 90 gear oil was the correct oil for the old 4 and 5 speed synchronized truck transmissions. Then when I did business with a serious repair place, I was told that was too heavy for any transmission. 50 weight engine oil. But a chart shows those two oils as being about the same! When I bought my truck with a Spicer 7 speed, I drained out some light, reddish, very clean oil. Darn! I wished I had left it alone. I'm sure it was synthetic. Anyhow, maybe a transmission is like an engine, more damage is done in the cold, with heavy oil, than running on a hot day with light oil? Consider what's lubricating the back end of a big, newer, powerful farm tractor, pulling hard, in the heat, for hours.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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