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Gear Lube for WD final drive

M

mr.precision

Member
Replaced both gaskets on my 1948 WD's final drive covers, and drained out the thick-black goop that was in there. After installing the gaskets, I filled to the level plug with Ford 90 weight oil, which I had in the shop.
Then I got to thinking that the Ford 90 wt is not an EP gear oil. I believe the book calls for 85-90 EP in the final drives.
So rather than take it all apart again, does it make any difference?
My guess is that the Ford 90 wt is fine for straight cut gears. I do use the tractor as an arena drag, so it does get some exercise.
 
Are you sure book says EP which stands for extreme pressure(I think) You need GL oil(gear lube) GL hangs on and climbs the gears to lube all ,whereas EP is made to be pumped as in later models.If not running in real cold weather consider 140.
 
GL-4 and GL-5 oils are EP. The reasons for the question is that the "ford 90 wt GL-1 mineral oil" is not EP. I have GL-4 and GL-5 rated oils in all of my vintage tractor diffs and trans. There was some debate going on about using modern GL-5 oil in vintage tractors regarding EP additives that may harm yellow metal bushings. Most modern 85-80 and 95-140 GL-5 rated oils are yellow metal safe, and I have never experienced a problem with them.
So back to the original question.... yes the GL-1 is probably better than the goop that was drained out of the WD's final drives. And it's probably OK for use in the future. It's just NOT an extreme pressure lube.
 
my point was EP is not made for a WD. It would be for a tractor that has pressure lubrication in the tran . just my understanding of it.
 
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