I have a '66 c10 250 automatic transmission. The engine was replaced a year or so ago with a long block - new gaskets. It now has 5k on it and has an oil leak on the rear of the oil pan. I anticipate the bolts need tightening. I know that I will need to drop the starter - but there is also a cover where the transmission meets the engine - and I believe that will need to come off as well to tighten all the pan bolts. I have checked the valve cover bolts and tightened some of those. I have also checked the oil sending unit and that is not leaking. What else should I be aware of? The oil drips off the bottom of the pan and the transmission cooling lines immediately after running the truck. Advise please - Tim-o