85/140W Gl-5 from WalMart (Supertech) states on the label that it is safe for brass, bonze etc. It's cheaper than the other GL-5 gear lube available at NAPA. TSC, etc.
GL-1 90W will be a little noisier, as I can testify having put that in my Oliver 60 rowcrop after changing the gunk that was in there.
To flush out the gunk and water - Not sure I'd put gasoline in the differential as the seals may suffer. I've used diesel fuel, but had the best luck with universal tractor fluid (hydraulic oil) as it will absorb water better and provide some degree of lubrication, which gasoline will not. It also won't damage your seals. 2 gallons is sufficient as long you don't work the gears hard.
My 2 cents.... done it to all my vintage stuff with no problems yet. And the 85/140 is definitely quieter... even in Olivers, which are notorious for noisy differentials.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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