Grinding after hitting small bumps/when on uneven roads

All pertaining to a 1998 Tacoma, 137k miles, 4x4, Manual Transmission, Manual Locking Hubs, 3.4L:

I have finally run into a problem that I can't solve by looking at old threads, so I made a new one. As the title says, my truck currently has an occasional, but very aggressive, grinding that occurs after hitting bumps (just small bumps typical of in-town driving) or on uneven highways. It sounds like it is coming from the front or center of the vehicle. The grinding generally last for 5-30 seconds before stopping. Braking does not affect the noise, neither does engaging the clutch. However, the grinding almost always ceases at low speeds. The car shifts and drives fine.

Here's what I have tried so far:
-I had similar symptoms in May 2023 and suspected the driveshaft was responsible so I replaced the front and rear u-joints (used Spicer for all) as well as the carrier bearing. That got rid of the noise until mid-December.
-mid-December 2023 the grinding I mentioned above began and I suspected I maybe poorly installed the front u-joint so I replaced it (again, using a Spicer). Upon replacing this part, I noticed that one side of the companion flange which goes into the transfer case was worn to such a degree that the u-joint cap could be pressed in 50% of the way by hand. That didn't seem right so I replaced it with an OEM companion flange from the dealership. However, the grinding persisted after replacing the flange and u-joint.
-Just to cover all my bases and make sure that I hadn't prematurely worn out the carrier bearing, I replaced it again to see if it would fix the grinding. This did not fix the grinding.
-Too long didn't read: I rebuilt the driveshaft, I still have this grinding

-I have checked the brake dust shields and they are not contacting the rotors
-I don't have any symptoms of worn brakes (squeaking, etc.) and had the brakes looked at in May, all was fine with them.
-At around 120k miles I replaced upper and lower ball joints, wheel bearings, and inner/outer tie rods.

Since all of this began, the service interval for my differentials/transmission/transfer case was reached so I serviced them. All had clean oil and no metal shavings.

I do have a bad passenger side strut which I am going to replace soon but I don't think that would create this sort of grinding.

Does anyone have any ideas of what it might be? Because it is so similar to the symptoms that were solved originally by rebuilding my drive shaft, I have been pursuing that route but it could totally be something else. I have been chasing this grinding down for a couple months to no avail, any assistance is appreciated.

 

A low value option to try would be the transmission mount.

How are your rear brakes?

Wheel bearings?

 

My front wheel bearings are only 17k miles old. So I think they are good. I did not replace the rear wheel bearings when I did the front so they are a possibility. When I had brakes checked in May they said the rear ones where looking good; however, that could have changed in 6 months.