well.. not sure about the pro mod.. but i just cut my own tranny.. all i did was remove every other dog and webbing.. so where there were 6 there are 3.. took me a total of an hour and fifteen minutes to do.. the gears aren't as hard to cut as everyone claims.. i didnt use and end mill or anything special.. just the bench grinder, cutoff wheel on an air tool, and some smaller cutoff wheels on my dremel.. cost me 8 bucks if i remember right... and the hour and fifteen minutes includes disassemble, cutting, cleaning, and reassembly.. i took a few pics..