Hello! i have a project at college in which we have to manufacture a differential. We have decided to eliminate the crown and drive pinion (from engine) and replaced by a simple chain mechanism for ease for manufacture. However, there are 4 more gears (one each for the half-shaft, and two planetary gears) to make. i was wondering if someone could advice me about their type (e.g hellical, bevel etc, simpler the better), ratios of each, and other such info... thanks in advance!