I have came across the option of a sport master lower unit with the torque master gearing in it. Is there any difference between the 2 besides the looks? I have a 1998 Champion 203 with the 1998 Mercury Promax 225 (2.5) on it, it had the torque master on it that is not rebuildable. My insurance wants to put a sport master casing with the torque master gearing in it. Will this work or is the Sport Master going to hamper my heavier boat.