The powerglide in my 68 El Camino has developed a leak. I suspect it is the front pump seal, because I rarely drive the car, it just waits in the garage until the next car show, and the seal has probably dried out. Because I will only drive it a few miles, and then put it away again for months, what I have been doing is topping it of before I drive it. It performs well when I do drive it. I have been using transmission fluid with stop leak when I top it off, but my garage floor is a mess. I'm not worried about the mess, but I am about the tranny. I am going to ruin it by doing this?