Leaky transmission lines would cause the fluid level to drop and eventually cause the transmission not to shift and go.
The most common reason for a transmission to go bad is not maintaining it properly. Another cause is hot temperature. Heat can break down the fluid that protects the transmission causing it to fail.
Transmissions can go bad for any number of reasons, but mostly because almost nobody ever changes their transmission fluid. It should be changed at least every 50,000 miles .
The fluid could be too low to allow the transmission to shift. Depending on where the fluid leak is, the leak could be through a bad solenoid or soaking electrical connections, stopping the transmission from shifting.
the cooling tank in the radiator for the transmission is bad
yes
Bad seal? Bad cooling line to radiator?
Transmission modulator valve is bad.
Your engine will speed up & the car won't go any faster (transmission slipping) Or you can pull the dipstick & smell the Transmission Fluid if it smells burnt you may have a problem with the transmission.
A bad internal transmission cooler located inside the radiator. Fluid is pumped into it and you could have an exchange of fluids. If the transmission fluid looks like "pepto" (pink) you will being going for a rebuilt transmission. Antifreeze reacts with the clutch plates inside the transmission.
overheating? Low fluid level? Plugged filter? Bad pump?
check transmission fluid level bad transmission?