72 205 tc leak

[72blue]

I know what all of you r thinkin...they all leak. Well, when it was new I am sure it did not. (It is a 72 half ton 4x4 short bed.) So I rebuilt (or I had it rebuilt) with new bearings and seals etc. All the gears looked good so that is all that was done. Heck, the bearings all looked brand new, but the kit was already there so...
hooked up the speedo and went for a spin and there is a leak at the speedo cable, big surprise. Did research on this site and changed the sleeve that threads into the case and took it into get stereo and when I got there, guess what, yep still leaking. the case is not overfull nor is there trans fluid in the case.
The only thing I haven't looked well at is the gear itself to see if it has a groove or wear on its shaft or something like that because the sleeve is new and has the seal inside which should "seal".
What am I overlooking? Help me please!