Th400 plug leak

[Sgt Gus]

What the pluk this plug for? Testing? Looks like it is leaking. I haven't finished filling the transmission yet after filter gasket and WOT doohicky and solenoid.
Pull it and pokie or is there a specific gasket?

 

[nvrenuf]

I could be wrong but since it would be unusual for a leak to creep forward (against wind, inertia, etc) my bet is the leak is coming from the selector shaft seal.

 

[Bextreme04]

It's blowing up from around the pan gasket. Chances are it was leaking there at some point in the past.

That plug does not have a gasket. It's a standard NPT pipe plug and it is where you would connect a pressure gauge for troubleshooting. It should have a PTFE thread sealant on it. You can just snug it up a bit if loose.

If it IS the selector shaft seal, you can buy a kit that comes with a seal remover, new seal, and a seal installer tool. It's a pretty easy job to do.

I would just spray the whole thing down with degreaser, give it a light scrub, and then hose it off. See if any leaks show back up after it has been thoroughly cleaned.

 

[Sgt Gus]

Thanks guys. I had something fresh, so I'll ck the plug and clean up. Yes, I suspect the selector shaft seal. I didn't know what to call it. Thingy that changes gears sticking out the side of transmission.