I heard somewhere that you want to keep the front and rear diameter of the tires within 1/4" of eachother, and definatly under 1/2" of eachother if your running in 4 wheel drive. Am I correct? Can I drive around in two wheel drive with different diameter tires front and rear? It would be nice to have some mudders on the rear and some all terrain on the front, but I am worried about difficulty matching diameters with todays sizes and tread depth differences. Is this a possibility? Or am I just looking for trouble in the drivetrain?

2002 4dr Kia Sportage 4X4
Tires:235/75/15, Wheels: Black 15x8 Steel ProComp 2.5" B.S., Hubs:Warn Manual, Lift:3" UPYOURKIA, Trailer Hitch, Cargo Rack, Clinometer.