My 200-4R tranny has a ghost leak that I just have not been able to stop. I've changed the pan gasket twice and even sealed the whole perimeter of the pan with high-temp rtv. Not pretty but it eliminated the pan leak as far as I could tell. I also rtv'd up the speedo cable connection, and the white wire connection, and the kickdown cable connection.

There is still one small drip though coming from the very front of the transmission. It is higher than the pan because I have rtv'd up as far as my finger could go behind the torque converter. It is coming from somewhere up there and I have done all I could short of removing the torque converter...

I have an entire tube of rtv on this thing and it still leaks!

 

converter seal

 

Yep, input shaft seal.

 

Great. I'm guessing I'd have to remove my transmission to replace that?

 

Yeppers.

 

If there's any possibility it's coming from the passenger side ? tighten the trans. cooler lines.

 

Check the converter while you have it out.

The leak at the front of my son's 700R4 that I assumed was a front pump seal failure, turned out to be a cracked torque converter. I found this out after R&R-ing the tranny 3 times after second guessing myself and finally taking the tranny to a shop to have them look at the front pump. The guy told me to check the converter for a crack or cracks at the weld where the snout meets the converter body. Visually I could see nothing. Plug the snout and gently push a little air in there and whaddya know, fluid bubbling from underneath a weld.

I don't know if this is an issue with your particular application, but it never hurts to do a little extra preventive maintenance during pain-in-the-butt procedures.