I'm using silicon spray, already had someone rock the truck, can't locate itStop spraying rubber bushings, what spray did you use?
It's most likely not your PS steering bushings, turning the wheel and hearing the noise doesn't necessarily relate.
See previous comment:
Mouse squeak or barn door creak?
You can recreate the noise by rocking the truck? Get someone else to rock the truck while you get down below and try to figure it out.
Or, we can keep taking guesses and accomplish nothing =]
spray and pray is the way
It's almost like a mattress squeak. It makes noise from just me getting in and out of the truck.