02-22-2011, 08:04 PM
Join Date: Jan 2011
Location: East Central Florida
Transmission leak diagnosis help needed
I read with great interest the thread about the leaking transmission and how it turned out to be the output shaft seal because it seemed like it may have been my issue.
Now I'm not so sure.
Here's what I have going on:
About a year ago I took it to one of our local holes and sunk it pretty good. I checked all my fluids and found that the tranny was a little watered down so I set out to change the fluid and filter. Along this time I noticed a leak and figured the new gasket would take care of it. Wrong. After going through 2 attempts (and 2 gaskets), I finally put some RVT around the bolt holes and along the rim of the pan. This worked.
The leak was coming from the dead center of the rear of the pan, or so it seemed. I had no fluid along the lip above the pan and it appeared as if nothing was coming the top of the tranny. The pan had a slight bend in this same location so I did my best to straighten it and loaded some RVT in it
Fast forward to this year. I moved the Jeep to the driveway, which is on a pretty severe incline, and noticed the leak returned. Very small, just a slight drip throughout the day, but over a few weeks it made a sizeable puddle underneath. It appeared it was coming from above the pan lip, but in front of the trans mount as the front side of the mount was wet. It didn't look like any was coming around the pan bolts or the rear of the pan as these areas were dry.
After reading the other leak thread, I thought maybe my issue was the output shaft seal, but I haven't had any responses to my questions in the threads so I sought help from a local trans shop. He said it could be the seal but gave me another possible scenario. Something about a valve in the torque converter.
He said that if the valve goes bad, it will allow fluid to leave the converter and go back into the pan. This, of course, will cause the fluid to leave somewhere so it usually comes out the top side. He gave me a test to conduct on it. Check the level and make sure it's got enough to make a trip. Drive it around and check the fluid again. It should be the same level, then let it sit and check it again. If it's higher then the problem is the valve.
I did that today and there was a difference, but not a huge one. I now have the Jeep sitting on level ground and so far no leak.
1. Could it be the gasket/pan?
2. Output shaft? What else should I look at to determine if it is?
3. Torque converter valve? Anybody experience this before and if so is it a problem with TJ's?
4. Any other places to look at?
Thanks for any input you can give me!