Do they all make this noise? And what is it?

I've had the truck since 2021-07, its a 4.6 4x4 and after departing and traveling roughly 50 to 75 feet or so, there is this subtle clunk'ish sound from the front. It's very consistent, and I notice it mostly after its sat at an hour or so. Its too faint to capture on video / audio but you can somewhat feel it in the cab or at least I imagine it. lol

Anyone have an explanation? It's in 2H.

Edit: I did an experiment tonight, it is not distance related (red text), its speed. About the time it hits 15mph you hear the sound. Does that help anyone?

Basically keep the speed low trying to verify the sound and thought for moment it wasn't going to happen. I went to the corner store just two miles away. When I left and hit 15 mph it repeated on cold engine. Now to know if it does it fully warm?

Edit #2... Changing this to RESOLVED. It appears to be the ABS module doing a self check.

 

Check this out from 2007... no real answer but some suggest it's the ABS unit doing something? Perhaps some self test?
https://www.toyotanation.com/threads/2007-tundra-clunk-at-15mph.202157/ last post on it was 2016.

With your radio and blower off, listen on first cold start as you hit 15 mph. That thread points to the fact that all G2's do it.

Edit: here's another. Some of the 2WD guys say it happens too, then there are some in this thread saying its something with the 4WD doing something.

Because the ABS unit is mounted to the cab by the driver, I'm guessing that's it.
https://www.tundratalk.net/threads/front-end-clunking-noise.723337/

It's like something is engaging/disengaging....

 

Yup, that sounds like the ABS modulator pump self-test.

 

Thanks!
So, basically its running the pump to do a pressure test or something? Question, when if ever does the fluid in the ABS module get cycled? Does that occur at any level when doing two man, manual bleed at all four corners? Or only when a utility is used to cycle the module?

Come to think of it, I think my IS-350 does this too! And I never figured out what that was and forgot about it!

And for the record, I used Techstream to disable that stupid door lock/unlock in/out of drive/park for no reason. So it is not my door locks!