The housing not only has to with stand the load, both external (car acceleration in all direction) and internal (force transmitted through the bearings), but it also acts as an aligner for all the shaft to have the correct distance between each other. So, the design step will be to make a functioning shaft aligner which can be realistically assemble and shrink wrap around the gearset first. Then any reinforcement can be added onto the structure later.

During assembly the gear set must be able to be placed inside the transmission before it is closed. The transmission housing must also produce a sandwiching effect on the gearset so that it can be seated tightly onto its bearings. To do this the bell housing will be attached to the motor first, then the complete gearset with its bearing pressed will be place in place on the bell housing. Finally, the mid plate is screwed on and provide the sandwiching effect on the gearset.

After the bell housing and the mid plate were designed, a simple surface is drawn to encase the whole gearset and given a thickness of 1cm to allow screw tapping and other guide pins. Low-volume production parts like the transmission housing are usually manufactured by CNC machining. the most common material for CNCing is aluminum, so our transmission housing will be made of aluminum 7075. testing the housing in a simulation, we found that the 1cm wall provides enough strength that the transmission housing can withstand every load that might happen during the race easily.

Applying fillet to sharp edges and the design of the transmission housing is done.