Differential Gear Box

This is a design of gear box for presentation or use it in RC car. Axle shall be made of 3mm diameter steel rods. No bearings are assumed. The ratio of bevel gear between small (8 teeth) and big (40 teeth) gear is 1:5 as input. 4 sun gears(16 teeth) are rotating in the center as output. The design of casing can be designed according to the use.