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It could also just be worn draglink ends.
Have someone turn the wheel quickly from side to side (engine running) while you watch those ends. If they "raise up" when turning, they are probably worn out.
The nice thing is that swapping in a new set of draglink ends is cheap and easier to do than anything else discussed in this thread. In fact, this is the VERY first wrenching project I did on my K5.
It really helped tighten things up and get rid of a large "dead spot" in the steering.
Check it out, you might be pleasantly surprised to find it something simple.
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If you reread his first post, he said that he changed those and only those so far.
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Anyway
You said that you checked and there was no cracks, well obviously you don't know anything about those cracks then, because the start under the box where you can't see them unless you unbolt the box, and when you do that if you find cracks deal with them and do not postpone, or you will end up stranded on some trail like i did.
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