2001 Ford F-150

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As far as your problem you say when it idles you don't hear anything? How about when you're driving put it in neutral and listen. Is it still there? Can you give me a general direction of where it might be coming from? Let me know.

Right, when the pickup idles, there is no clicking sound at all. Even when it's in neutral and driving - only when I accelerate sometimes you hear the clicking - it's not a constant. To me - the clicking sounds like it is coming from the front rather than the back. Clutch works fine and I thought the U-Joints would still be good, but maybe not?

Only when you accellerate huh, does it happen every time you push on the gas? Let's try to narrow it down more. How about when it's parked and you hit the gas? Have a friend/family member rev the engine while you're under the hood listening. Let me know how it goes.

When the truck is in neutral and u rev the engine, there is no noise. When you put it in gear and start to accelerate, that's when you hear the noise.

I have the same problem. It sounds like the valves are rattling but it's not the valves

Sorry for high jacking your question. I don't know about his clicking but mine clicks or rattles up tp 45-50 mph or all the time when I am pulling a trailer. It makes no noise in neutral. I had just had the transmission flushed and differential fluid changed when this started.