MY TRANNY WAS LEAKIN CAUSE IT HAD TO MUCH FLUID SO I HAD THE GASKET CLEAN AND A NEW FILTER..........BUT B4 SINCE IT WAS LEAKIN IT LEAKED IN TO THE MUFFLER AND CAUSED IT 2 SMOKE BUT NOW IT SMOKE WHEN I STARTED IT & WHEN I TURN IT OFF IT SMOKE FROM UNDER THE CAR.........SO SHOULD I JUST DRIVE IT FOR A FEW DAYS AND SEE IF IT GOES AWAY ALSO JUST GOT IT FIXED LAST NITE..............