My system holds just about 2 full quarts of fluid. I run a tranny cooler that I had lying around and I have plenty of capacity. No squealing from the pump as many others have had. From what I hear, the people that have the squealing problem, are not running a cooler/larger reservoir. My thoughts were more capacity plus more cooling will make the pump run at it's best. Took me all of 10 mins. to put the pump in line with the return line.