This is a late comment. I would try another slip yoke. The tail shaft appears good, but the yoke may of twisted. NO HAMERING should be done, on or off. The yoke must slide easily or it is not a "slip yoke". Transmission or u-joint damage will occur. Note: Driveshafts and both yokes, should be balanced as a unit and when adding new components and marked for same location when replacing u-joints.
