Transmissions, while generally durable, can be highly complicated devices. For this reason, they are also expensive to replace, and maintaining one will save you a lot of headache and money in the future. This article from Clark's Automotive, Inc in Manassas, VA discusses how your driving habits affect your transmission. While automatic transmissions are by far the most common, there are still a considerable number of manual transmissions on the road, so this article covers both.