I'm looking into installing a remote transmission filter, but I don't know it I should put it on the supply side (before the cooler) or the return side(after the cooler)... I'm lost on this aspect of it. Bob (or you members) please help me! I can tell you that I am planning on running an Fram HP-1 for the filter, it's a stock cooler on a '07 Ford F-150 XLT Crew Cab 5.4L 4x4...it has the tow package and ALL fluids have been changed over to Royal Purple. I don't want to have to take the pan down again. It has a Mag Hytec pan on it now, with a brand new trans filter and fluid. The truck has 60K on it and it just had is 2nd transmission service don to it. The first was a drop the pan, new filter, refill... the one they just finished was complete flush, new filter with Royal Purple.