The pittman arm has no wear points. One end is splined to fit on the steering box sector shaft and the other end has a tapered hole to accept the ball joint on the center link.The most likely causes of slop in the steering are the joints in the center link and idler arm, followed by tie rod ends and lastly steering box preload. If you have someone slowly wiggle the steering wheel back and forth while you closely inspect every part of the linkage for lost motion, you'll have a better idea of what to replace. BTW, I've done the Jeep shaft swap on my Camino. It's a great way to find that last bit of steering precision, but only after everything else downstream has been tested good or replaced.
Bill
