I dont think it was overfilled because it went from no leak to leaving a trail behind the car. I had to park it and put in more trans fluid to make it home. It has a chrome aftermarket dipstick. The car also had B&M Trick shift in it went the leak started, dont know if that makes a difference. It now has regular Mercon trans fluid in it. I'm gunna drive it today and see what happens. Also this car is a rev manual valvebody with a 5,000 stall conv.