"Thunk" from under the floorboard when braking?

[Badfish740]

I'm noticing that almost every time I break I can hear (and feel) a "thunk" as if something is shifting or flexing underneath my truck. Could this be a sign of failing ball joints or other worn front suspension components?

[stroker27]

holy crap, i have that 'thunk' whenever i start out from a light. at first i thought it was a bad motor mount. but its not. now im thinkin tanny mount, what the heck else could it be? i wonder if its the same thing... if i start out real nice and slow it dont do it... does yours thump and u can feel it in your seat? where does it feel like its coming from?

[kefier2001]

I get a thunk/pop when I turn the wheel at slow speeds sometimes, but I have jacked it up, shook the wheel up and down, side to side, with NO play, so I am still trying to figure that one out!!

[aldo_45030]

i have the same thump when appling the brakes sometimes. I am going with ball joints ....if i crawl under i see fresh signs of bright rust washing out of the joint area like something is moving. oh boy 1 more thing to do .

[Dave]

just cured that problem on mine it was ball joints and sway bar bushings

[Clay Henry]

Originally Posted by Badfish740

I'm noticing that almost every time I break I can hear (and feel) a "thunk" as if something is shifting or flexing underneath my truck. Could this be a sign of failing ball joints or other worn front suspension components?

Check those balls and also check your brakes to make sure everything is nice and snug

Originally Posted by stroker27

holy crap, i have that 'thunk' whenever i start out from a light. at first i thought it was a bad motor mount. but its not. now im thinkin tanny mount, what the heck else could it be? i wonder if its the same thing... if i start out real nice and slow it dont do it... does yours thump and u can feel it in your seat? where does it feel like its coming from?

Yours sounds like rear end slack...maybe a bad U joint also. Get any vibration at highway speed?

[Badfish740]

Looks like I have a whole lot of summer projects to work on...Bad GEM, swaybar bushings/ball joints, and I just realized I have an oil leak! Actually I get the "thunk" from the rear when taking off sometimes too. It also happens when I'm cruising along at say 40-50 mph and I apply throttle to pass. Still sound like a bad rear universal?

[Dave]

didnt you just buy that thing

[Dave]

Originally Posted by Badfish740

Looks like I have a whole lot of summer projects to work on...Bad GEM, swaybar bushings/ball joints, and I just realized I have an oil leak! Actually I get the "thunk" from the rear when taking off sometimes too. It also happens when I'm cruising along at say 40-50 mph and I apply throttle to pass. Still sound like a bad rear universal?

yeah i agree with clay on that one bad u joint as well. i would get that done asap driveshaft rebuilds arent cheap

[SouthernSmoker]

I had a thump when I braked. Turns out one of the bolts holdin the caliper braket on had fallen out.