Have you checked the power steering fluid level?

 

what jonesey said. Mine seemed to make a little noise when cold. Some members are changing the fluid out with Royal Purple or Valvoline syn. and that seems to quite them down. I changed my 02 with RP and never heard anything else from it.

Just my .02 worth.

 

At full lock the releif valve is opearting. Do you hear it when you steer the truck normally??

 

Suggestion; do not hold the steering wheel at full lock because this will cause the relief valve to pop off. In effect you are straining the entire system. Go to full lock but then back off on the wheel maybe 1/16 to 1/8th of a turn. You will find that the front wheels still stay at full lock but you have relieved the intense pressure generated when everything is forced to the max. This will probably also stop the noise.
I have long been of the opinion that many steering problems are caused because drivers continuously force the steering to full lock and hold it there with the mistaken idea that this will give them a tighter turn.

 

[quote author=Mexstan link=board=20;threadid=20110;start=0#msg189524 date=1064547063]
Suggestion; do not hold the steering wheel at full lock because this will cause the relief valve to pop off. In effect you are straining the entire system. Go to full lock but then back off on the wheel maybe 1/16 to 1/8th of a turn. You will find that the front wheels still stay at full lock but you have relieved the intense pressure generated when everything is forced to the max. This will probably also stop the noise.
I have long been of the opinion that many steering problems are caused because drivers continuously force the steering to full lock and hold it there with the mistaken idea that this will give them a tighter turn.
[/quote]

What he said. Exactly correct. Usually its the little old ladies hold the steering at the lock...I thought everybody knew that.... ;D
You wouldn't run a backhoe against the ends of the cyls all day would you?? Your power-steering system is just a big hydraulic pump and valve system. The relief valve is there for that reason. It should not fail but when you go full lock and hold it sometimes the relief valve will stick or open. When it sticks the pressure will go through the roof (causing leaks) . HTH good luck.