Don't know what the hell is going on with my chevy but took it out this afternoon, ran it up to 100, held it there for 2 miles(if it blows, it blows) brought it back down to 65 and ran it there for 5 miles and parked it with no oil leak. Two weeks ago I rebuilt my 350th tranny and didn't put in a shift kit. With my high gears it seems to hold at 75 in 2nd gear before dropping into 3rd. Might have a pressure built up that one day which causes it to push the oil out the pan