SNOKING
Well-known member
The "death Wobble" is a common problem on both the Ford & Dodges (RAM) 4x4's being that the front axle is a "live" axle, where as the GM is independent suspension. There are several so called "fixes" for the issue so you may want to try the Ford Forums, or do a google search for your specific front end wobble. Of course that still is zero help if your towing over weight. Good luck.
Safe travels.
Death Wobble happens at highway speed not going slow as the OP stated.
He should go under it and see if he can turn the front drive line while in 2x4 mode. Then turn it to lock steering each way and repeat.
I think something is going on in the front diff. Could be a front axle U-joint! Chris