[rad454]

I started my engine up several weekends ago. It is mounted in the subframe and the tranny is attached. I can check for leaks real good like this and what do you know, I found one. 1 week after I started the engine/tranny combo I noticed some fresh 90 wt under the M-20, very light layer on the underbelly. Where does this come from? How could this be? The tranny is freshly rebuilt and the only thing I could come up with is the filler plug could have used a couple more turns to get it real tight.
Anyone have a similar leak?
Louie

[keithl1967]

You could put some teflon sealer (any local hardware/plumbing store) on the threads of your drain plug...

[nashcar]

If you over filled the tranny it will leak out the front bearing retainer.

[1962vette]

Muncies are nortorious for leaking out the front of the 1" counter shaft bore. Had luck using a non hardening sealer between the bellhousing and the front of the counter shaft.

[rad454]

Paul, I used a sealer on that 1" counter shaft seal you were referring to. I will start the engine and watch the area for leaks. If I see it leaking from that area, I'm going to seal it externally with JB Weld. I'm not taking that tranny apart because of a small leak.
Does anyone know what keeps transmission oil from exiting the front main shaft. There isn't a main oil seal. There is a large thin flat washer but nothing to keep oil from spilling out if it was tipped on it's end

[Sauron67MM]

Not too long ago someone posted a solution to this problem with pics and a tutorial. I cannot find it yet. Many posts come up with "muncie" in a search slowing my hunt.