Can someone explain what these numbers mean ?

[mbryant]

I got the model number off my 78 Johnson 85HP.
Model # 85ETL78D

I understand the "85" is the HP and the 78 is the year. What does the letters mean ?

Thanks

 

[dew2]

evinrude-johnson-gale-ID-chart.pdf all model years

 

[mbryant]

Thanks Now I understand !