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.
This post was edited by Tom Fleming at 03:14:27 12/05/12.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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