I'm pretty sure. The 47 2nd series were using the SM420 right? It doesn't have the drivers side PTO side cover a SM420 would have. I haven't driven it yet to find out where reverse is because the gas tank is out for some TLC. I was feeling around with the shifts today and to my knowledge reverse in the SM420 is towards you and back and there is no gear there. It also has the original torque tube so I'm sure its a factory transmission.