How can I transmit horizontal torque to vertical? I have a setup where I have a step motor which I am attaching a gear onto. The motor will make the gear stand horizontal in a small vehicle. Is there any good gear combinations of LEGO gears that can transform the  horizontal torque of the gear into vertical torque that drives the wheels of the small car I am building?

Are there multiple combinations of LEGO gears that can provide this kind of torque transmission?
There are a number of ways to do this. This is one of the easiest and earliest methods:



For that design, you'll need this part (3650):



You can also do something similar using a combination of bevel gears or double bevel gears: