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What Oil in A Transmission and Final Drive

I drain them and put a couple gal of Diesel drive around a bit tne drain and flush then refil with 90 wt. The level plug is behind the brake rod on the left side of the tranny. Tranny and final are in the same casting. So pour in thru the plug on top of the tranny till it comes out the level plug and you are fit to go.
 
Gene isnt the final drives on the A and the 140 seperate? I usually take the final drive pans of and refill them in the plug just above the pans with 80w90 oil.
 
80W90 is the right viscosity. The final drives and the transmission are separate and do not share the oil supply. Flushing the tranny with diesel or kero is always a good practice when changing the gear lube.

As a final note, the other suggestions here are fine, so use what ever gear lube you have, as long as it is new and clean. The heavier weight lube might be a bit too stiff in cold weather depending upon where you live. People get a little too indigestive around oil and gear lube for these old girls. They like CLEAN oil and lube, changed appropriately. Unless you are constantly working the snot out of your letter series tractor, clean oil and new filters are the best thing you can do for them......................much more important than what brand or multi-vis vs. straight weight vs. detergent vs. non-detergent. Keep 'em clean and keep 'em full. You will be just fine.
 
Yes i was thinking about the diff drive. With out a doubt the finals are different. By the way the finals sure arent very nice to service i guess thats why lots are dry. Some think the finals can just use grease but that will not lube the top bearing of the diff shaft or the gear on that shaft.
 
Dont forget to drain the PTO so it getsnew lube also. The oil slinger in the tranny throws it up to a passage which drains into the PTO assy and that passage can get plugged not letting lube to get there.
 
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