Clunk noise in Ford F-150?

I have a 2001 Ford F-150 xlt 2wd with a 4.2l engine and a manual transmission, 150,XXX miles on it. Recently like a 2 months ago it started making a clunk/knock noise when ever I accelerate from stop to go. It just got worse over time and now it sounds fairly louder. I did the slip yolk greasing but that didn't help, maybe I applied too little grease? Anyways any idea on what it could be? Thanks.

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