I finished installing my used transmission yesterday, test drove came back no leaks. I drove to work today and the pavement underneath looks llike all the fluid I poured in came back out. I replaced both front and rear seals as well as the rear main seal. I had a leak at the pan with the rubber gasket provided, I siliconed it and replaced. Is it possible the pan sealing is the source or a seal not seated correctly? Where should I start?