I thought only Model T's got a death wobble in the steering?
Had a friend who restored a Model T, he spent years restoring it - then sold it within weeks of getting it on the road, because he couldn't handle the death wobble in the steering!
Here's my .02c worth:
1. Install a heavy duty steering damper on the track rod.
2. Replace front shocks with a premium brand heavy duty gas shocks.
3. Balance front wheels, and brake rotors, too.
4. Inspect all front end rubber bushings and replace those that show signs of wear, or are spongy.
I owned a SWB '77 4WD F100 that had the long-radius-rod-supported, Dana solid front axle. This thing was a beast, it originally came with manual steering, and was all over the road from new.
Fitted power steering when nearly new, and that improved it some, by reducing the number of turns lock-to-lock and providing more control.
Never had a death wobble problem, but this thing was a beast on dirt roads at speed when lightly loaded. You'd hit washboard on one side and it would be sideways within seconds, as the washboard impact went straight back to the centre of the chassis via those long radius rods, and pushed the back sideways. If you weren't on the ball with lightning reflexes, you'd be off the road, or on your roof before you knew it!
The huge tyres on the F series provide a lot of rotating weight to start death wobbles if they become unbalanced. Had a problem a few times with mud buildup on the inside of the rim, creating sudden massive imbalance.
