Hi All, As a process of my project work, i have been asked to develop a manual transmission. I have to design gears (Crown, Planetary and Sun gears) to achieve a final reduction of 30.45, with first stage gear reduction & second stage reduction being 5.28 & 5.77 respectively. Can any one help me in solving this problem for gear designs ??? I have space constraints also, but I can take care of it, by controlling the number of teeth. I need to know how to start and where to start. Can any one guide me ??