Sure. Get a second opinion or get someone who is good with cars to check it for you.
DIY: $20.00 (for the rear main seal) plus your time Mechanic: Depends on the mechanic/shop but will likely run you around $300.00
rear main seal
You will have to replace the rear main seal. This will require that the transmission be removed.
Water can not leak from the rear main seal, only oil. Most likely there is a leaking freeze plug near the rear main seal dripping water onto it.
Rear main seal.
Overheating can damage any seal.
They don't make anything Liquid in a can that will FIX a rear main seal leak. Time to replace the seal and be done with it.
It could be something simple and inexpensive like a valve cover gasket or something more expensive like a rear main seal leak. You could try some stop leak but it is better to have it looked at by a mechanic.
Depends on where the leak is falling from it could be the rear main seal leak, transmission back part connected to the transfer case, or a front main seal leak, the transmission part connected to the engine block also a possiblity is the shifter gear box if you have a standard, which also be in the front near the front main seal.
Well the rear main seal is at the rear of the engine and would leak engine oil if it was leaking,but if the rear main seal is the leak? it usually requires the removal of the transmisson. But if you know that it is transmission fluid then I would check the transmission cooler lines, transmission cooler, and transmission pan gasket for leaks.
No a rear main seal is the rear seal on the crank shaft of the engine. That portion of the engine is wear the crank shaft connects to the clutch and pressure plate (manual transmission) or where it connects to the torque convertor automatic transmission.
There are some oil additives you can get, that might stop the leak. But if the leak has developed, the only way to fix it is to replace the seal.