Abstract: An automatic transmission fluid exchanging device includes drain and supply tubes to conduct used transmission fluid from and unused transmission fluid to a vehicle transmission. The device further includes a supply pump in the supply tube to flow unused transmission fluid into the transmission. A pair of flow control valves are disposed in the respective drain and supply tubes to allow the operator to match the flow rates of fluid through the respective tubes.

Abstract: An external adapter includes an elongated housing formed with a pair of internal open ended longitudinal fluid passageways defining, respectively, a used fluid and an unused fluid passageway. The used fluid passageway is internally threaded at one end thereof for engagement with a mounting fitting formed on a transmission filter mount for vehicles with external transmission fluid filters. The opposite end of the used fluid passageway is threaded for engaging one end of a used fluid fitting which includes an opposite end for connection to a drain hose for withdrawing used fluid from the used fluid fitting. The unused fluid passageway includes a first end which aligns with at least one filtered fluid port on the filter mount when the adapter is engaged with the mounting fitting.

Abstract: A flusher and refill system for automobile, subassemblies such as an automatic transmission includes a storage tank for waste transmission fluid and a storage tank for unused or replacement transmission fluid. A fluid-conducting hose leading from the subassembly is connected to a fluid flow path leading to the waste fluid storage tank and which includes an electric valve and flow rate monitoring gauge. A second fluid-conducting hose is connected to a pump for pumping fluid from the unused fluid storage tank. The rate at which fluid is pumped out is monitored and a flow control valve in the new fluid flow path is adjusted so that replacement fluid is pumped into the subassembly at the same flow rate as used fluid is being pumped out.