Automatic transaxles transmit engine torque and power to the front wheels. Through gear ratios and torque multiplication, the transaxle helps to adjust the engine rpm at various speeds. In the highest gear, the transaxle is at 1:1 gear ratio, and in overdrive transmsissions the final drive ratio is typically 0.75:1 allowing less rpm to accomplish the same vehicle speed. Automatic transaxles use a low viscosity fluid as the power transmission. Automatic transmission fluid (ATF) operates various hydraulic components within the transmission and acts as a lubricant between components to reduce the coefficient of friction (heat) and prevent unusual wear in metallic components. Since this fluid travles through the entire transaxle, it is easy for damaged components and small metal particles to affect other circuits within the component. A filter, located in the drain pan – some transaxles have filters placed between the case halfs – helps to remove these particulates. Improper maintenance or a clogged filter, however, will typically fail and allow contamination throughout the transaxle.