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2007 Ford Fusion - Tire replacement

In your today’s article, about one failed tire—could two tires, rather than four be replaced, thereby keeping the differential balanced? 2/23/2019

2wheel Drive, two tires okay, new ones on the rear.
AWD, best bet is four new tires. Or get the EXACT same tire as the other three, then have the shop shave the new tire down to the same thread depth as the other three.

AWD has 3 differentials, Front , rear and center, if front and rear tires are not the same size, the center differential will be turning all the time and it isn’t designed for that and will wear out prematurely.