Click, when moved 5 feet in reverse?

[LibertyUnites]

I wasn't sure where to post this, as I haven't figured out what is making the noise. The truck moves and drives without any noticeable problems, but when I place it in reverse, I almost always hear an audible "click" after moving about 5-7 feet backwards. I realize it's a pretty vague description, but does anyone have the slightest clue what this could be? 2002 F-150 SuperCrew 4.6L 4x4 w/ just 50k miles.

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[glc]

First thing to check would probably be u-joints. It could also be a parking brake issue. Guessing here, but it might be an issue with the 4wd actuators.