I have one Farmall M with some gear whine. Particularly in reverse and low, with some in all field gears. I now have 90wt gear oil in the transmission. I read a reference to Lucas oil on one of the forums here and that got me to thinking about putting some in my transmission. It is pretty pricey, however since a gallon costs about $35.00. My question is, do you think it might work to quieten the transmission whine? The statement on the jug said engines or transmissions and I wonder how it could work for either application. All responses are welcome. Thanks , Ellis
 
As long as it does not use the oil for hyds I would save your self some $$ and use graphite. Years ago an old guy told me to use it in any car or truck with a stick shift to help cut down on noise and wear and it does work well and is not all that much as for $$
 
I think all old Farmalls have some gear whine. It gets worse when you replace 1 new gear and it runs against a worn old gear. Worn bearings can cause gear whine to. I never got too excited about gear whine.
 
it want hurt that modern 90wt that pours like 30 wt motor is most of the problem, daddy always run 140 wt in an m and its still going today, you can't find true 140wt anymore it's close but not the same 90-140 isn't much different than 90wt should be, we also use 140wt in an h with no problems, I got a super a that after replacing bearings and seals in the transmission and rear end it was filled with 90-140 and the gears seem to clash worse even waiting a little longer for the transmission to stop spinning before trying to shift into a gear 4 bottles of stp stopped that 20 years ago,also we don't live where temperatures get as low as they do up north
 

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