Bumpy ride!!!

[eaglescout526]

From the pics of your front end, I’d do a full rebuild. Cut your losses of what the actual “solution” is and post the components that are possible to your issue and never look back. 
 

If this was my truck, I’d do a full front end rebuild, replace all that’s rusty, crusty and cracked with new and drive it. If the issue were to persist after, WE would all know, it’s no longer in the front suspension and you’d have peace of mind knowing that your front is practically all new.
Hell! Go the extra mile, clean the axle up, paint it, replace the coil spring isolators if that has never been done. Those isolators help cushion the ride in the body and prevent road noise.