Drive shaft leaks

[Bjv69ss]

I'm getting closer by the day to firing the engine for the first time.  Today I filled the transmission with ATF.  As I was going about my business after filling it I noticed ATF all over the floor   After investigating the leak it turns out that the center of the transmission yoke has what looks to be a machined tapered hole. That's the source of the leak.  Was this hole used for the centering of the yoke for machineing and then pluged with some kind of GM goo after?

My thought would be to use some ATV and a small screw and flat washer to plug it. 

Anyone had this problem ?  How did you fix it...

Jerry or John I know you have the fix.

Thanks Joe

[Bjv69ss]

I thought I'd add to my own post   I got the fix from the local drive line shop near us.  The guy told me to drill it and tap it.  Then install a screw with a wide enough head that would hold an "O" ring.  Lock tite the screw in and don't over tighten the screw as to squash the "O" ring.   It has worked very well.