Gennie used to make a bolt on shifter for the FMX, are they still in business? Lokar might have crushed them just like Vintage Air did to Old Time Air. Too bad. Another thing, when you change oil in them, the converter can be drained also. There are two drain plugs in the face of the converter, 180 degrees apart. One will be at the top to let air in while the lower will let the oil out. Make sure there is PLENTY of oil in the trans when you refill before you start the engine, so nothing runs dry for any length of time. Very important. They hold a lot of oil, I would guess about 12 quarts or so. But then again, the C6 holds a lot of oil too.