A major cause of transmission failure is contamination. Would you believe a particle as small as a hair can lead to transmission failure? It can. A human hair is only 30-35 microns in diameter, while the smallest particles most transmission filters will remove are 60 microns in diameter. Small contaminants, not removed by the filter, remain suspended in the fluid until they eventually find their way to the internal components of the transmission. If transmission failure does occur, a significant amount of contaminant will collect in the cooler. With the installation of a JASPER remanufactured transmission, it is imperative that a clean supply of transmission fluid is supplied to the new unit.