Loud knock after 2 weeks of ice and snow driving

Is it knocking all the time when you are driving? Does it speed up and slow down with your vehicle speed? Is it in the engine compartment or underneath, like something hitting the tub or the transmission?
 
Is it knocking all the time when you are driving? Does it speed up and slow down with your vehicle speed? Is it in the engine compartment or underneath, like something hitting the tub or the transmission?. This is what it's supposed to look like.
Most noticeable on takeoff and over bumps. This is what it's supposed to look like. I figured it was just the bushing.

https://www.4x4xplor.com/T-CaseTSB.html
Rubi tcase linkage correct.jpeg
 
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