I had my M20 rebuilt about 500 miles ago. I have a new 383 as well. If I start the car, I can let it idle for 15-20 minutes and nothing leaks. But if I drive for any length of time it begins to leak. It does eventually stop leaking after it sits for several days. I can't tell if the front of the tranny is leaking, or if it's coming from the back of the motor. It's coming from the back of the oil pan/front of the tranny. Is this an obvious tranny leak since it doesn't leak until I drive it, or is it not that simple? Mike. :beers: :beers: