The ISF process is a surface treatment that gives your transmission an extremely smooth finish. The process involves tumbling all parts in a special media and chemical combination that removes surface imperfections. This results in an increase in horsepower by reducing friction between all moving parts. Transmission life and reliability are also greatly improved by removing stress risers left from the machining process. One of the most noticeable improvements of the ISF process is shifting. This process has been used in NASCAR, F1, and NHRA racing for years. Click on the images below for larger photos.