Do you change all four of your tires?

Something with a transfer case ain't near as picky as something AWD with a viscous coupling.
Wachya talkin about? This is a viscous coupler (not mine).
1763866346353.png

Its used in the NP 229 transfer case.
1763866494888.png

I don't recall ever installing just two new tires on with the 'AWD' but sure have run on the spare, and sure have swapped fronts to rears to even out the wear.