I bought that truck with 100,000 miles on it. At first it was a good truck to drive. Soon after I bought it, the head gaskets blew. I had them replaced and after that the motor had a ticking problem. A few hundred miles later, somehow or another tranny fluid started getting in the crankcase. The first time I changed the oil after the fix, I was dumbfounded. Ihad a 6qt. Oil drain pan and it overflowed it and way more. How does transmission fluid get into the engine?