oh i see-
they drilled and tapped a hole in the end of the stock tailshaft? i pulled my tailshaft and replaced with one that fits a yoke for the CV shaft. haven't had any probs with mine yet and have been a few thousand miles both on and off road. got it all from tom woods although the SYE was via advance adapter but the shaft was tom's. i was always real hesitant about the design of the SYE that you show here.
87yj,6cly,5spd,NP231,4.5"RE susp,1" body,SYE,CV,32x11.50MTR's,D30,D35posi