I've got a driveshaft out of a 70 challenger automatic with 7260 u-joints for sale and the 30 spline slip yoke still attached. One of the loops on the driveshaft around the unjoint cap has a small crack, see picture.
Also have a 3.55 geared 8 3/4 741 case, open with very low miles on the rebuild.
PM if you want pictures or more info. Located in New Orleans