No, there is a pitman arm on the steering box and two idler arms on the linkage.
The Pitman arm is attached to the power steering pump, which is connected to your steering shaft, which is the long rod looking thing to the right of the engine, the idler arm is to the left of the pitman arm attached to the fram, it basically looks like a strip of metal bolted to the fram that is connected to your shaft that is also connced to the pitman arm
Remove the belt, then remove the bolt holding in the idler pulley.
Remove the old, damaged idler pulley and replace it with a new one.
According to my internet research, to change the pitman and idler arm on a Chevy truck, one must remove the two bolts holding the idler arm as well as the nut holding it to the truck. Then to remove the pitman arm, remove the nut and the drag link.
Center link
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You need to replace your tie rods, pitman arm and idler arm. I had the same problem and it went away. Cost me about $120.00
ARE YOU SURE YOU HAVE TO CHANGE THE PITMAN ARM? MAYBE YOU MEAN THE IDLER ARM? THE PITMAN ARM IS RALREY EVER CHANGED. THIS IS THE ARM THAT CONNECTS THE STEERING LINKAGE TO THE POWER STEERING BOX. ITS AT THE BASE OF THE STEERING BOX , UNDER THE CAR, IT PROTRUDES FROM THE STEERING BOX SHAFT CONNECTING SAME TO THE CENTER LINK.
When you turn the wheel a gear in the steering gearbox turns a lever called a pitman arm. The pitman arm is connected to a central rod which is connected to another pivoting lever called the idler arm. The pitman arm connects (in the other direction) to a tie rod, which turns one wheel. The idler arm connects to the other tie rod which turns the other wheel. The pitman arm and idler arm always move parallel to each other, hence the name parallelogram steering. A look at an image of the system would probably help you to understand how it works.
It's a left hand thread. Crank to the right.