Answers above. I guess I need to figure out the caster.No, you don't have enough caster. You look to be still running a complete OME rear pack. Have you removed any leaves?
Just the bottom one
No, you don't need a track bar (panhard rod)
Did it wobble before you swapped the front back to SPUA?
Are the bushes tight in the springs? (I notice they're not OME bushes)
They are tight and energy suspension
Do the shackles compress the bushes slightly? centre bars can cause problems getting the bushes snug.
Get rid of the Z link
Confirm the steering box is within spec and/or can be adjusted to get it in spec, this is measured as starting torque at the input shaft- consult the FSM
Confirm the condition of all tie rod ends.
They are good too
Obviously, an out of round wheel or severely out of balance tire can trigger wobble.
Confirm the condition of the wheel bearings, measured as starting torque
Confirm the preload on the kingpin bearings, measured as starting torque
Confirm the condition of the knuckle seals.
The factory fix is kingpin preload and knuckle seal replacement. These damp the wobble as close to at the wheel as possible. There's a misconception that the steering damper is present to prevent wobble. This is not the case.
99% of death wobble is caused by kingpin wear. All the other issues can be a trigger, but they're not the cause. A car with kingpins to spec can have all the other stuff all over the place and it won't wobble, but if the kingpins are loose it will wobble and fixing all the other stuff won't stop it.