Another idea...
Nothing to do with the squeeks but,
If you fear loosing control at speed or after hitting small humps in the road...
Our 69 Mach 1 was doing this. when we hit a hump or bump in the highway, the alignment seemed to change. (and was). The cam bolt on the lower accentric on the control arm was moving. It wasnt loose, but had grease and grime under it and when the weight shifted, the control arm moved too and resulted in many scarry moments. Check yours.
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