I fought this a while back with oil everywhere around the front of my transmission. (auto) After jacking it up on stands I set the choke and let it at fast idle and laid under it till it got warm. There was a very small oil leak at the passenger rear side of the valley pan gasket directly above. It had managed to seep in between the motor and trans and then dripped down and was slung everywhere inside the bell housing. If your trans fluid is clear and this is black I would think it would be oil rather than trany fluid.