I'm wondering if anyone knows how much pressure this speedo fitting is under.  
Some of you may have been following my story about swapping in an oddball AMC transmission that's essentially a Ford 3.03 with a planetary gear OD setup on the back...

Anyway- I want to cap off this speedo (of course it's the spot that's the tightest location) but I don't know how much pressure this is under.  One guy using the same transmission said he used silicone to plug it up but I'm not sure I understood what he plugged up.  The threaded piece fits over the crimped nipple.  The guys on the HAMB said to put a rubber cap on it.  I'm not so sure that the rubber cap I have is stout enough, but it fits.  

Looking for thoughts on how much pressure this fitting is under...and how else I can get rid of it...Can I snip this crimped part off completely?  Should I remove the blue gear?  
Thanks in advance.

Shouldn’t be under any hydraulic pressure. I think the suggestion of a “rubber plug” referred to the expanding kind, like they make to replace soft plug (freeze plugs, core plugs, whatever you call them). I don’t quite understand how it all goes together, but pull the gear, put the housing in with the o ring on it, and I’m guessing the other part secures it. Plug the middle with whatever will work.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

Can you make up an aluminum plug the size of the part that has the O ring and hold it down with the factory clamp?


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Sounds good, Miker.  Thanks.
I had one suggestion to weld up the hole in the threaded part...I might try a rubber cork first, assuming I can get one the right size.  If that doesn't work, the threaded part is getting welded.  

Someone may correct me, but I wouldn’t use a cork. Even the ones from a good bottle of wine. If that center “pin” is where the drive cable went, and that’s the leak, a good cleaning in solvent to get the oil out, a bit of lacquer thinner, and then some JB weld might work. But a touch of weld would be better.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

I took all the pieces out today and welded up the back end of the threaded piece just enough so it still inserts where it is supposed to...then I used RTV to make seal the two parts together.  Fingers crossed, it's good.