Any black sludge is not good... But if the Tranny isn't slipping, clean the pan thoroughly and install a new transmission filter& gasket, and of course, fresh fluid... and it wouldn't be objectionable to maybe add a transmission conditioner with that fresh new fluid which can be picked up at your local auto parts center along with the rest of your parts.
It can be many colors. Black (if its black that is bad) but it should be red.
you gorget to say, what transmission you have. in gear dont say much. sorry? Bad transmission? Bad clutch?
"Thy Name is Mud" meaning: You have a tarnished, or bad, reputation.
I don't know much about this but I would say if your pee is black that is a bad sign and you should definitely see a doctor.
Probably a bad head gasket.
This is pretty much a no brainer. Transmission cooler section inside your radiator is bad or you have tried to cross a flooded creek with 3' of water.
bad transmission.
pro bably the diesel leekedNot knowing what the vehicle is I would say the transmission vacuum modulator is bad.
There are several reason why this could be happening. There could be a linkage broke, a bad pump or just a bad transmission in general. Most likely the pump is bad or the transmission is bad.
Low or bad transmission oil, bad transmission solenoid, vacuum line issues, worn transmission gears, bad torque converter.. all possible reasons.
Bad seal? Bad cooling line to radiator?
Not enough transmission oil, too much transmission oil, bad transmission oil, a clogged breather... all are possibilities.