Typically the 'Wobble of Death" is cause by bad panhard rod bushings. Fairly easy to diagnose in the following steps:
With a second person behind the streering wheel, engine running, vehicle in park, level ground, parking brake applied, have the person turn the wheel back and forth whilst looking for movement of the panhard rod under the front of vehicle where it [panhard rod] meets both the axle and the frame rail.
There should be NO movement of the rod itself. If there is movement, replace both bushings.
Whilst the bushings are cheap... the removal of the old bushings will have you very frustrated without the use of a press.
Good luck.
1990 RRC, 3.9L, AUTO "Willow Pond" (Sold)
1996 D1, 4.0L, AUTO "Lucas"
1999 RR, 4.0L, AUTO "Belle" (Sold)