Need help figuring something out on my truck, 2003 f250 4x4. I’ve been on here with same question and replaced several parts as per recommendations. The parts I mention as being replaced were all worn out. Still can’t figure it out.

There is a hard clunk coming from right under my feet as I’m driving, I can feel it in my left foot like someone is hitting right under it with a hammer. I’ve replaced all tie rods with mood heavy duty parts, sway bar link and bushings. Shocks are brand new, rotors and calipers are brand new. Basically my whole front end suspension and steering is brand new. What do u think this could be?

Double check your shocks; that was the cause of a mysterious bump in my truck. Grab the shock and wiggle it; it shouldn’t wiggle, so if it does, that’s most likely the cause

To be more clear on what I have done to try fixing this knock... all parts I mentioned were replaced and torqued down to spec. I’ve double checked to make sure nothing came loose on me. Track bar, all tie rods and tie rod ends, shocks, brake rotors and calipers, sway bar links and sway bar bushings. Had a friend help and we each took turns under the truck looking for the culprit while the other was jumping on the bumper trying to recreate the sound, which we couldn’t do (speed bumps and big pot holes seem to be the thing that gets it clunking). Neither of us saw anything questionable. There is a very little bit of play in my hub assembly and wheel bearings causing a minor sway on highways. They will be getting replaced this weekend. I could be wrong, but I don’t think they are the cause of the loud clunk I feel hitting directly under my foot when I drive over speed bumps. Could the wheel bearing cause this clunk? I have a friend that was a ford mechanic for years. After telling him about this and what I have already done, he said it is likely the cab mounts. What are everyone’s thoughts on it being cab mounts?

This may be a long shot....but I had a mysterious thunk that I could feel in my feet, I couldn’t recreate it manually and it only occurred over potholes/bumps, etc at a decent speed. Sound familiar?

I ended up finding it by chance. It was my drivers side rear door. The catch bar for the door latch gets worn out over time and allows the door to have play. Go out and push on the door near the handle. If it makes any clicking noise at all, this may be your loud thunk.

All i I did was wrap a round or two of electrical tape around the catch where the latch hits it. Magically, the thunk hasn’t returned and he door latches tight. I doubt the tape will last long, but I haven’t been able to find the part online so I just need to go scrapyard hunting.

Anxious to hear if this works!

I ended up replacing just about everything, as stated in previous comments. The final thing I replaced that solved the problem was both the front bearings/hub assemblies. While doing this I checked everything to see it was tightened and torqued to spec. I did notice that the drivers side front shock was a little loose, not much though, so I tightened it before reassembling (my clunk was coming from drivers side right under my feet). That could have been the problem. It was either that or the hub assemblies, which were rusted and looked horrible. I no longer have that clunk no matter what size bump I go over at any speed. Like you, I would also get a clunk when pulling into a driveway and going over the small lip of the concrete. I’d def replace your shock if they are messed up, hopefully that solves it. If not, read all the comments in this thread, I basically checked them all and had no lick until I replaced the hub assemblies and tightened the drivers side shock

I’m willing to bet that in the end it was the slightly loose shock that was the culprit. It’s amazing how the tiniest bit of movement can cause the amount of noise it does.