A transmission is a vital part of your vehicle and allows the power and speed of your truck’s engine to be transferred to your truck’s wheels as torque.  Gears, clutches, flywheels torque converters and synchronizer rings are all internal working parts of a truck’s transmission.  These parts can sometimes be replaced individually due to excessive wear or damage, sparing the cost of an entire transmission replacement.  If the entire transmission needs to be replaced, many manufacturers like BD Performance, offer complete transmission kits.  There are also several companies that manufacture transmission control electronics that allow a truck’s owner to change the shift patterns of a transmission to change performance based on needs such as hauling and towing.