I put new Spicer joints in and made sure the C-Clips are locked in this time.

I took the drive shaft over to a local drive line shop so they could make sure it was balanced. He recommended to change ends where my slip yoke was because he likes to run the drive shaft with the less weight ( needed to balance ) at the transmission and the most required weight (needed to balance) at the rear.

So he moved the slip joint to the other end. Checked the balance and he said it was perfect. It did not need any additional balancing.

I still think the feeling I initially felt is related to the gearing ( hope not a axle bearing) but will be able to tell more after another test ride with a fixed U-joint.