All hydraulicfunctions of the transmission are based on this pressure-what is especially of concern for these purposes is theclamping force which is applied to the clutches and bands toget them to hold against engine torque. These are hydraulic circuits that areparallel to the components that are check valve suppliers used for shifting.
Increased performance andmore efficient shifting is now available for vehicles ofalmost every manufacturer thanks to the few companies thatare willing to do the research and development work requiredfor this rapidly growing segment of the automotiveaftermarket.k. Flow through the cooler and lube circuit isincreased and the converter clutch application time is alsoreduced.
As many Toyota and Jeep owners know, the AW4 / Toyota 340,A340, and A341E series of transmissions are generally verywell made and demonstrate excellent durability in unmodifiedapplications.The soft, sliding shifts that are part of the originaldesign are not appropriate for increased horsepowerapplications, towing, off road use, racing, etc.
As you can imagine, the transmission's operationalcharacteristics can be drastically altered and alsocustomized to the given application through modifications tothis component.Transmission and valve body upgrades are not only forAmerican made vehicles anymore. The first thing that needs to be done is to increase thehydraulic operating pressure of the transmission- thispressure is known as "line pressure".