Vibrations at 0-35 and 65-75. Already replaced Ujoints and Carrier. HELP!

So I am having some vibrations at certain speeds. It started about 2 weeks ago. I had the U Joints and Carrier replaced 08/12/2020. The vibes came in pretty rough and had a squeak with it. I assumed it was the carrier or u joints again. Further inspection and I had some good play on the drive shaft so I replaced the carrier again. Either I ordered the wrong part or I am just bad at repairs. After replacing the carrier myself the problem persisted.

I took it to a shop and they said the drive shaft still had a lot of play and replaced the carrier again. 3rd times the charm.

Got the truck back today. Still feeling vibrations at 0-30 and then it stops. Comes back at 65-75mph. I only feel it on the accelerator and when I am coasting still in drive. It feels like it is towards the front end but I can't really determine where exactly on the truck. Before I took it to the shop it was definitely from the rear. No vibes at idle, no vibes in reverse or neutral. The balance and tires are all ok also.

Any ideas on what else it could be?