An Older post I made last year:

I have a 1999 Chevy Venture van. It is running great except for this
squeaking noise. When you turn and hit a dip it squeaks like a
tricycle with a rusted wheel. It also does this when slowing down or
just moving through a bumpy parking lot. It has done this also on a
smooth surface just stopping at a red light. The shocks seem fine
because the van drives very, very smooth.

I took it o my mechanic and he greased some bushings, and said
that should fix it. Well it didn't. Anyone have any idea what it is? I
have parked the van, and then stood outside of it, and rocked it side
to side, and front to back, and can never hear it. It is coming from
the front of the vehicle for sure. What could it be?

Newer post:

It's me again. Still got the same squeaking noise as described above.
I am going F*****G nuts. Finally now you can actually rock the van
side to side and hear the noise. My son rocked, I sprayed. Nearly 2
cans of silicone spray on every part I could think of. Still
squeaking. I took it back to my mechanic and told him that we could
finally make the squeak happen. He heard it finally and was almost
100% positive it was the ball joints. It sounds as if it is coming
from the middle of the car. Scheduled the repair.

Took it to him Wednesday. He sat aside many hours to try and please
me. He said he took nearly the entire uncarriage apart, checked
bushings, sway bar, control arm, shocks, struts, tires, rotors,  and
even checked ball joints throughly. After getting my van back it's
still squeaking. He knew it would be because he said after checking
everything he could possibly think of, several things I didn't name
cause I cant remember he said he could find nothing.

Everything was greased fine he said. He is frustrated as well. He said
after working on cars as many years as he has he just cannot find out
where that damn noise is coming from. It is very irritating. The only
thing he could come up with is that the van has possible been wrecked
and could be coming from the frame somewhere. We cannot find it.
Anyone have any ideas?