I don't know what I should put on it to make it have more take off power. I was thinking maybe a new rear diferantial but I don't know what im talking about.

You don't have a rear differential if you have front-wheel drive. The differential is in the transmission on front-wheel drive. And even if you had all-wheel drive (4X4) you still couldn't change it without changing the front to match.

A little supercharger might help - but I don't know if the engine or transmission would handle it very well.