Can I just replace the rod bearings without having the crank turned?

I have a 2000 ford ranger that has a 3.0L V6 flex fuel. A salvage engine cost 1600-1800 which I found absurd since they all have within 40000 miles of the engine in my truck. It has developed a very slight rod knock. It is not even noticeable unless you pull a plug wire off and then it's loud. So, my question is, can I just buy a set of standard sized rod bearing and drop the pan and replace them, or would I have to have my crank turned and buy new connecting rods and undersized bearings? A set of rod bearing is only like 27 bucks. I was going to replace the rear main seal anyways. So, what's your're opinion? Any help would be appreciated since I am not a professional rebuilder or anything…

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