Thanks RustyRR, I was just looking that up on a Hyundai Tuscon, because of wrong tire size. The car needed the transfer case replaced (several thousand $) and the coupler replaced $850. All of that and the guy only drove the car 20 miles with the wrong size (1 size) tires on the rear. The only way ,I would buy an AWD, ..is if I bought it new. That way I would know what tires were ever put on it....What do they do about spare tires/ most cars have donut spare ????