[The Turk]

I had a squeak like you describe, it was the torsion bar rubbing on the inside of the drivers side control arm, caused by worn out saggy rubber control arm bushings.
I believe this is a fairly common problem, if it turns out the torsion bars surface has been scored you should replace it.
If your control arm bushings have never been replaced, you might want to consider the Elephant Racing PolyBronze bushings, they won’t squeak like polyurethane because the movement is on bronze bearing material riding on a stainless steel bearing race.
I’ve updated both front and rear suspension and love them, no squeaks, no harsh ride, just accurate suspension movement.