I have a PSC gear box going to a PSC hydrolic ram. I am ucing the stock pump and resivior on my 5.3l vortec. I was just told I need to extend my filler neck for extra fluid and have all the items to do this. I also just got a PSC heat sink style Power Steering cooler. My question is, when mounting the cooler does it have to be lower than the output on the resevoir?