In the time we've been discussing this leaky 350, it could have been removed, totally sealed, and back in service. There are several possibilities, but the very first thing to do is get it CLEAN, and locate where the leak is actually coming from. Then fix it! Possible problem areas are the manual shift shaft seal, the dipstick/fill tube O ring, the accumulator cover O ring, and the vent hole in the output slip yoke. Obviously, the pan gasket can also leak, plus the front and rear lip seals at the converter and the output yoke.
Grt it completely clean and dry, jack up the rear wheels and put the axles on jack stands, and run it in place until something starts leaking. The other method, hanging onto the undercarriage on a road test, is really not an option!
Jerry
