Well after 9 years my impeller finally gave up a rib. While there were no cooling issues, on winterizing , I found a rib that was caught by my tranny cooler. I had to find when I shot my 8 minute impeller replacement video that was back in 2011. While this is too long and I do not advocate it, I will take pics when I change it in the spring or later this fall. It also had no problems sucking antifreeze from a bucket during winterization.