Hi Ron, Welcome to the forum.
I am a little confused, do you have a sketch or picture of the thing? If it is as I think it is, then the torque is going to be the same at the end of the 36" shaft as it is at the flange -- unless -- the shaft is 1" diameter and winding up 3 turns before rotating the load.
OK, so I am winding you up with the shaft winding up, but the load the gearbox is resisting is the same as the output torque. If that is what you are asking.
We could use some more details.
Generally, I will not give you the answer to your question, but I will guide you into discovering how to solve this yourself.
Insanity: "doing the same thing over and over again and expecting different results." Albert Einstein