Bad seal? Leaking cooler line?
NO... They are 2 different seals. If the transmission seal is leaking then the fluid color will be RED that's leaking. If the rear main seal is leaking then it will be oil leaking from the engine and it won't be red.
the seal is bad.
Because your transmission has a seal that is leaking.
Hopefully it's just a seal going bad, and not damage to the case or shafts...
Rear main engine seal or front transmission seals
Work needs to be performed. Also depends where it is leaking from. If pan is leaking just drain transmission fluid and install new pan gasket and refill transmission with fluid. If front seal leaking then you will have to pull transmission and replace front seal.
Whatever seal the fluid is coming out.
The output shaft seal has failed and transmission fluid is leaking by, and that would explain the transmission fluid appearing there.
There are several things that can cause your 1986 Nissan 300 automatic transmission to send you a start leaking fluid the most common cause is a blown seal in the front of the transmission. There is a seal in the rear of the transmission. The transmission pan gasket can be leaking.
This depends on a lot of things. What kind of car it is, what kind of transmission, what seal or gasket is bad, give us something to work with here.
If a transmission is leaking fluid, it is likely that a seal or gasket has failed. Replace the gaskets and seals and the leaking should stop.