Farmall cub

   / Farmall cub #2  
My 1951 service manual says SAE 90 gear lube so todya it would be 80W-90 gear oil.
 
   / Farmall cub #3  
if you use an 80w90.. get one marked MT1

as for 90wt not available.. it sure it.

you can get 90wt gl1 from napa

some places sell a 90wt gl3 as well.

soundguy
 

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