Have you checked the front wheel bearing preload? Any play if you grab the tire at 12 and 6 o-clock?

I have a shake sometimes at 60mph but only if there is a strong side wind and I have the steering wheel slightly turned to correct.

I am almost positive it is from a tiny bit of slop in the preload.

Chad

89 ext cab 22re 4x4 267K miles (for sale)
94 Land Cruiser Factory lockers
95 T100 4x4 ext cab