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I have a 1935 model E Cletrac and want to change the transmission and final drive oil. At TSC I find 80W-90 and 85W-140. Is one of these suitable?
  I have the original Cletrac Lubrication Recommendations book, and it mentions SAE 30, SAE 40-50, and SAE 60-70 depending upon the temperature.

I have an unstyled model E Cletrac serial number 6A78. Only one of the Cletrac serial number references that I have seen list anything earlier than 1939.
  What I would like to know is if this 6A78 is the last model E of the year 1935 and if it is the last unstyled model "E" made.