An automatic transmission valve body is a major component of a vehicle's automatic transmission system and directs pressurized transmission fluid to a network of valves that engage appropriate clutch packs for smooth gear shifting. These valves use pressure as hydraulic signals to determine which gear set, also called band servo, to select when the vehicle changes speed.Know More
The valves inside the transmission valve body receive pressurized hydraulic fluid from the hydraulic pump, called the governor, to drive clutch and brake actuators for optimal band servo ratio. The most important of these valves is the manual valve. It is directly connected to the gear stick handle and instructs which passages should allow hydraulic fluid to pass through.
Modern automatic transmission systems incorporate sensors that monitor car speed, throttle position, brake pedal position and engine load to control how soft or firm the gear shift must be. The sensors send vital data to the onboard engine management computer, which directs electrically controlled solenoids that redirect hydraulic fluid to the correct clutch pack.
The incorporation of these sensors has made self-diagnostics possible on modern transmission systems. A malfunctioning transmission part is detected early by the engine management computer which, in turn, alerts drivers by activating a warning light on the vehicle's dashboard.Learn more about Transmission
Some of the signs that a transmission is bad include slipping in and out of gear, problems accelerating, odors in the transmission fluid and transmission fluid leaks. Once a transmission starts going bad, these signs typically give a car owner time to have repairs done before the transmission goes out completely, so it's important not to ignore them.Full Answer >
A car owner can tell if the transmission is going out if there is a lack of response or leaking transmission fluid. A whining noise can also indicate a failure.Full Answer >
A basic automotive transmission tune-up involves inspecting and replacing the gasket, filter and transmission fluid. The transmission bands may also be tightened and adjusted during a routine tune-up. CarTalk recommends a transmission tune-up every two years or 30,000 miles.Full Answer >
A slipping transmission is frequently caused by a problem with the vehicle's transmission fluid. Additionally, important components of the transmission, particularly the bands, may be worn or broken. Transmission slippage can also be instigated by clutch malfunction in both automatic and standard vehicles.Full Answer >