i have a 78 115 lower unit from a parts motor seems to be good i put impeller in it my boat with motor im using is j140tlcte 83 model itook the lower off it and brought home to change impeller i thought i would put the 78 on my boat to test it out do you see any problem with doing that (the 78 round part where the gears are is longer than the 83 ) thanks for any help:joyous: