A: The color of transmission fluid one of the primary indicators of the health/condition of your vehicles transmission. When the fluid is dark brown or black which is indicative of a unit that has internal clutch pack damage, metal particles in the fluid or both, your transmission may have some serious issues. As a transmission begins to have shift issues or overheats the fluid loses its lubricating properties. This begins a downward spiral which may, if ignored, cause a complete transmission failure and may leave you stranded. Usually, if the transmission fluid is black, the transmission is at the point of complete failure and will need to be checked ASAP. Call or stop by Eagle Transmission in Mansfield TX. Our friendly staff will be glad to assist you in determining what your vehicle's transmission problem may be.