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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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