I wanted to use the c56 tranny with my 5efhe,but as the flywheel prob i decieded to go for c155 the original 5efhe one. But my ques is, 1) is all the c155 lsd? I knw the oem lsd casing is outside, shaft(driver side short) and rear mount is different than non lsd box.but dont if all of them are lsd or not. MY MAIN QUES IS 2)how to identify c155 box by inspecting physically?i have searched a lot but nothing found.photos in google seems like c52 box.so much confusing! Help me pls!