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ok here is oil 101..... in a multi weight the first number is its rating at 32* so 75 is its flow rate at 32* and the second numbers is its flow rate at around 180* (I cant remember) so the 75/140 will flow better at 32* then the 80/90. now flow rate is on a molecular leval not in the drive way.

If GL-1 is not out there (wisconsin it a SO only, dont know why) but any 80/90 with a MT-1 on the back will work great. If you are going to drive your Deuce in the cold you will want a 75/140 gear oil in the trans and t case and for the axles use amsoil 50W full syn oil.