Lots of threads in the forum on DW and the many causes/cures.
I replaced my front LCAs with a set of Currie adjustable Johnny Joint front LCAs from Savvy ( with WF discount!). I set them at 16" to work with my 3" lift.
The shimmy I've had for years at 47 - 53 mph (which was recently getting worse) is now totally gone. Steering has a solid feel now.
Many "mechanics" often fail to consider the control arm bushing wear as a cause of shimmy/DW