I take it from the shop manual (
http://chevy.oldcarmanualproject.com/1929_54chevyparts/04/220.HTM ) that it is called "transmission rear bearing retainer 4.317". It appears that an oil seal goes into it and then the universal joint front flange passes through the oil seal. Do you know if the universal front flange is the same for my enclosed system or different for the open drive shaft?
Thanks for all of the help here.
John