I have changed the cooling lines on a couple of these units and it didn't seem to make a difference. I have been looking at the troque converter and where the inside pump gear is driven by the converter it wheres a grove in the converted hub. This then allows the gear to twist on the hub and if you take a light and look between the converter hub and the gear it opens up an area large enough to let a lot of fluid through to the seal and I am thinking that this might be what is causing the seal to blow out. If I am right then the problem is what is causing the inner pump gear to wear a grove like this in the converter hub.