Oh hell yes....it will significantly reduce the life of your clutch packs if it's driven for a long distance. Basically it will act as if the rear end is always turning a corner.....therefore always slipping the clutches.
everyone likes to make fun of the silly people, but when your desperate things need to get done. i have to of the same tires for the rear, but i needed a rim and the only thing i could come across was a 14, and they don't fit the front. so moved on tire up and 14 in the rear. nobody could help me where i live and nobody sells steel 15 inch rims for my car.