Have you checked your wheel hub and bearing for excessive wear? Another possibility is that your Power Steering system (if your truck has it) could be either low on fluid or failing.
To completely and accurately answer this question I'll need more information:
1. Where in general is the screeching noise coming from?
2. Is the noise accompanied by a thumping, grinding, or vibration?
3. Does this noise happen EVERY time you make a left turn? If not, at what speed(s) in general does the screeching occur?
4. Is there an odd burnt smell that accompanies the noise?
5. Have you noticed any recent oily deposits under your truck where you normally park or after it has sat for a while?
Upon reflection, a third possibility comes to mind. Check the swaybar link and the bushings for the driver's front wheel. You might be in the beginning stages of link failure. While the link itself does not move or rotate, it does have an effect on how the wheel behaves. I had a similar problem with my Jeep and it drove me nuts figuring out what was wrong. It turned out that BOTH of my swaybar links were shot. Mechanics call it the "Death Wobble" because it is a serious suspension issue, though it is easily fixed. Fortunately I was able to replace them myself with link replacement kits available at my local auto parts shop for about $150. The kits came complete with the links, bushings, and all new fasteners so I didnt have to re-use any "questionable" nuts and bolts.
That sound may be your power steering pump low or out of fluid
It could be a power steering belt that is wore or stretched. If no luck with the power steering belt check the pulley.
The cause of a loud screeching noise when a person turns the wheels a little, could be due to the lack of power steering fluid. It could also be due to worn belts.
I just got a new power steering pump and my car is making a screeching sound, even after I changed the belts. What noise does yours make
When it starts leaking are making noise.
a screeching noise
i don't know if this is the same problem but when i had a screeching noise from under the hood it was from the fan belt. it needed to be replaced. the best thing to do is bring it in to a shop and have them find it.
why does my starter make a loud screeching noise when i start it?
Eagles make a screeching noise
Fruit bats.
YES it is. GM had a problem with the fuel pumps making noise and still does.
It probably needs steering fluid.