Just re-reading your post and checked my gasket collection. I have a set of Fel-Pro for the ball housing and it includes a large and small rubber gasket for the collar and where the ball housing bolts to the trans. There is also a thin flat steel ring which I presume holds the smaller gasket/seal in place.
At first read I thought I would have to undo the u-joint but realize I can remove it with the splined shaft attached. Or do I have to take apart the u-joint? Been many years since I did my Okie assembly and my memory is not what it was.
