I just had JC modify a brand new torque master gear case (1:75 gears) that I ordered from Jacos for my 300XS. I have an XB21 BasSport Pro with all the options; great boat. I still have the original sportscaster gear case (a spare now) in pristine condition. Monday I will order an Allison foil mainly for holeshot as I have read on the Allison website many members wanting a quicker holeshot. So I am going to spend a little funds to have fun.
JC does great work so if you are in the market for a modified case, JC is one and there are a few other very reputable companies just as good: Hydromotive (Tod), Tooters, etc.
Good luck.
Robert