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Use The SEARCH function on here. Lot's of good info there.
The Death Wobble issue has been beat to death (sorry I couldn't resist)on here.
In a nutshell
On STOCK Ford suspension it's usually caused by loose/worn parts, mismatched tires and/or out of alignment (toe in ).
On modified suspension......big and little tires plus dropped axle , reverse eye springs etc.
IMHO
it's incorrect caster.
When the whole car is down in the front it's tough to change the caster back to where it needs to be.
I had the same problem on a Hot Rod 32 roadster I have.
Everything was brand new or perfectly rebuilt. Alignment toe in/out on the money.
Nothing would cure it.
Finally.... after 3 years, 2500 miles and out of desperation I installed a So Cal steering damper.
Done and Done the car goes down the road straight as an arrow even on the roughest roads at any speed. RxR tracks don't even make it jiggle even a little.
No change to the steering effort, I don't even know it's there.