Hey all, I need some help… Tried researching but nothing was quite like my problem.

I have a knock in my front end. It is a speed-related noise…. Sounds rotational. It knocks more at higher speeds and vice versa. Recently, I replaced the tie rods and did only a visual alignment for the time being. I went on one ride and I got the death wobble pretty bad on a road (obviously from a bad alignment). My thought was that the violent wobble shook the axles loose from the differential…. At least it looked like it. This video shows what I mean:

However, I took them out and pushed them back in and they sit in the differential the same as they did before…. They seem a little loose. What could this knock be? Bad differential? Worn out axles? Driveshaft? I’m at a loss here….

Utah RZR Rentals