ball joint taper?

I'm not sure what you mean by 'ball joint taper'. The ball joint is a ball - spherical, I believe the term for a tapered suspension joint 'in the old days' was king pin. Is that what you mean?
 
He's referring to the attaching shaft.
Exploded_Ball_Joint.jpg
 
That's correct Mike. I figured someone on this board might already know the taper. 7-10 degree taper seems pretty common.
 
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