The role of the transmission is like the postman, transforming the power put out by the engine into the driveshaft, and the process is done by changing the arrangement of the set of gears that are the central component of your car’s transmission. If it's the manual transmission system, you have to manually shift the gears. For automatic transmission system, it can rearrange the set of gears with little intervention from the person operating the vehicle. The automatic transmission system is featured with a planetary gear set, and this set is used to respond to the output of the engine, and adjust accordingly based on the amount of the hydraulic pressure exerted by a special fluid. With the development of the technology, there is a distinct transmission called continuously variable transmission (CVT), which is more fuel efficient. Inspect your transmission assembly regularly and change it as long as there is something wrong with it. We offer you all GM genuine OEM transmission assembly with a discounted price.