727 and Drive Line

[mojavered]

I went to put my drive shaft in the other day.  I started looking inside the yoke and noticed that there was an area where the teeth had a larger gtoove between the teeth.  So, I looked at my tail shaft (already in the car) and noticed that all the teeth are the same distance apart.  I looked at another tail shaft on another 727 and noticed the same thing.  2 Quetions:
1:  I have not measured my drive line to make sure it is the correct shaft, but do the yokes usually have a large groove set in the teeth?
2:  If there is no groove in the tail shaft, does this mean that the yoke can go on any which way? 
Thanks.

[mojavered]

Is there any information that I can give someone that would help?  Thanks.

[72cudamaan]

That's a master spline. If you look closely at the output shaft you will probably see two splines that actually meet in a taper at the end of the shaft. This is where you would line up your master spline.

[Aussie Challenger]

 I think that is a carry over from the old ball & trunion which used to be bolted onto the back of the out put shaft.
 Tactransman may chime in with the answer if my comment is not correct.   

[mojavered]

Thanks, I will look at the output shaft a little closer and see if I can see the taper.

[Chryco Psycho]

there is no master spline , the yolk is missing 1 tooth for oil supply

[mojavered]

Thanks!  SO it does not matter where that missing tooth goes?

[tactransman]

Thanks!  SO it does not matter where that missing tooth goes?

Nope

[mojavered]

Right On