When driving down the road at a low speed the rear end wobbles. St higher speed it shakes.

get that wheel (etc) inspected, end fear.
make sure nothing there is loose now,
in real auto repair shop or suspension shop.

Is the UPPER part of the Sway bar connected to the Chassis

I can not imagine anyone using any vehicle with a wheel
noticeably leaning in or out

You actually, not only drive that way at low speeds, but at
higher speeds -enough said- makes no sense you would risk
your car & your life doing so

Obviously you paid a shop in a sincere effort to resolve some
issues

Here the thing

You can see & feel the wobble by hand,so both you
& any repair shop can see the problem !!

What sort of shop do you use, that gives you a vehicle
back in that condition & why are you here for us to guess
at something, when you should asking the place that took
your money, what's going on, or maybe check with a lawyer

Go to an Alignment Only Shop & have them road test
while you ride along

Then have them inspect for worn parts

If a hub bearing was bad, it almost always would make noise, more so when changing lanes at higher speed. Outer CV joints make a loud low pitched rattle when turning (corners). Inner CV joints raise hell at high speed- bad shake! Sway links affect cornering and clunk when hitting rough patches of road surface.
Is the vibration worse at 65 than at 50? If so, you are dealing with a wheel balance situation. Find an old time front end shop that will check the balance on the vehicle. You will have to turn off the traction control to do this or use an on-the-car wheel balancer.
If you feel it at some low speeds at it comes back at other higher speeds, then you are dealing with tire roundness. Possible more than 1. More common than we would like.

Have your front suspension checked by someone you trust. there are so many things that can cause the symptoms you're experiencing. shocks, balljoints, bearings, steering stabilizer, bushings.

Check your steering stability bar I had the same problem and it turned out that I had bent that bar.

The death wobble is basically when you are driving your lifted jeep down the road and the front end starts to shake violently. It can happen at virtually any speed, though mostly above 40 mph or so, and is a frightening experience, especially for those witnessing it for the first time. Now it doesn’t throw you off the road or anything … the front end just shakes. And the only way to stop it is to slow down and pull over. So it wasn’t that hard to get used to at first. But as it happened more and more, it seemed to get more and more out of control.

Also, I suggest check this articles:
- Cures and Fix for Death Wobble, and
- Fixing Jeep Death Wobbles

I'm owner from '93 ZJ, and solve it with this clues.

Hope help (remember comment and rated this).

Check your steering stability bar I had the same problem and it turned out that I had bent that bar.

The death wobble is basically when you are driving your lifted jeep down the road and the front end starts to shake violently. It can happen at virtually any speed, though mostly above 40 mph or so, and is a frightening experience, especially for those witnessing it for the first time. Now it doesn’t throw you off the road or anything … the front end just shakes. And the only way to stop it is to slow down and pull over. So it wasn’t that hard to get used to at first. But as it happened more and more, it seemed to get more and more out of control.

Hope help (remember comment and rated this).

have your tires checked for seperations before they explode on you going down the road.

check the ball joints for looseness this will cause an excessive shake at higher speeds

Have the tires been removed from the rim and rim spun on balencer to check how straight the bead surface is ? Strut Leaking fluid ? Ball joint or Tie rod bad ? wheel bearing wobble ?