The ultimate answer seems to be, tighten the steering box.

After a few hundred miles the vibration during braking seems to be gone.

I did replace the idler arm bushing and the steering dampner.

I had never tightened up the steering box on this one.
Used a 19mm socket to crack the nut loose.
A 6mm allen wrench to screw the center outward while
rocking the steering coupler back and forth until I could see pitman arm
move in better relation to steering coupler.

Hold the nut with a 19mm wrench while turning the 6mm outward.
When finished, tighten the 19mm nut again.

Noticeable difference in the steering and vibration.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
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03 Ninja 250