Old chevy movie on gears and how they work in transmissions

[MikeWi]

I love watching old videos like this. They did a great job, but the end of the movie has a demonstration that has no relevance to the rest of the movie because they never explain it! LOl
[video=youtube_share;aAWxZRuBXtw]http://youtu.be/aAWxZRuBXtw[/video]