system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does an automobile's gearing affect its torque versus its top speed?

What do they change/how do they use gearing to affect either, and can there be aspects of both with the same gearing?
gpt
The best way to explain this is to compare it to a mountain bike with multiple gears. The first gear has a large sprocket and it's good for getting off from a stop or going uphill and through mud, sand and snow. You won't be able to go very fast but you have all the torque you need to power through the terrain. At the other end you have the final gear, it's extremely difficult to use this from a stop but once you're up to speed you can really get moving. 
The gear reduction in a cars transmission works on the same basic principal.