Dodge Chrysler 45RFE - 545RFE Line Pressure Booster The simple direct plug in way to add performance to your transmission. The Line Pressure Booster modifies the pressure signal sent to the computer resulting in the computer raising the line pressure. The line booster has a 15-30 psi increase. Higher line pressure increases clutch holding power and torque capacity. Dodge Chrysler Transmission Line Pressure Booster cross reference to Sonnax 44957-LB2 ( 45/545RFE )