different Porsche trannies?

[bugsoup]

Could someone write an article on the differences (and pros and cons) of other Porsche transmissions? I get confused, not knowing alot about Porsche 911's, when the numbers 915 or 901, etc are mentioned. Even a list of transmissions that work in a VW conversion with gearing and weaknesses would be a great help. Also, include the years and cars that they were available in. Price is always relative, but maybe include the suggested value so we don't spend hundreds more than we should have.