It sounds like DW.
DW occurs when the suspension geometry is out of wack through wear (old age !) or mods.
Standard go to is wheel balancing, alignment, even (and correct) tyre pressures to all four wheels, no tyre issues like a bulge, obvious issues like worn out rubbers on sway bar and links, leaking or stuffed shockies including steering stabiliser, broken spring or two, sagged spring, ect…. Even something small if everything else is 99.50% correct can cause the DW.
I’ve experienced it, violent enough to actually break my steering stabiliser off the mount ! Once it starts, on mine it was always right on 80.00kph, it just progressively gets worse until you manage to pull off the road to a complete stop.
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Jeep TJ rebuilt 4.0L, Custom Steel Roof Racks, vintage ((Jeep specific)) 15” Centerline Hellcats,
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