From the factory, the function of the EPC solenoid is to increase line pressure during shifts up to 230 PSI and once the shift is complete, drop the pressure back down to 80 PSI. At 80 PSI, your Allison can't hold the added stress of aftermarket upgrades or even towing a heavy load.
The XD345 installs on the EPC Solenoid and installs back into the valve body allowing your transmission to effectively operate at 230 PSI all the time.
The line pressure increase helps to eliminate clutch slippage, poor shifting performance, and it extends transmission life.
The EPC Fooler Plug is easy to install and does not require valve body or transmission removal.
This product is an excellent modifications for any upgraded LML or L5P truck.