Noise when braking, changing gears.

There has always been a noise under my truck when I either tap the brakes somewhat quickly, or change slightly aggresively. A lot of times it does it when I'm simply applying the brake as I come to a stop. The only way I can describe it is a "clunk." When I tap the brakes under 30 mph, it will do it. Ever since a week ago when I had the 6" Fabtech put on, I've noticed it more. I don't know if it is relevant, or if it is just a mental thing. Anybody else have a truck making a similar noise? I want to try to fix this asap. My truck sounds like it is falling apart when I brake.

 

my dad's 07 2wd access cab just started having the same issue. I can't find what it is.