Wheels & Tires - Tires sizes.

On my f-body i have 18in/315 on the rear and 17in/275 up front. The wheels are from a c6 corvette that are jet black. My question is - I still have the stock rear end in my car and will these wheels and tires affect my rear end in any way? Is it more prone to break with these tires on it?

its more rolling mass than the stock wheels but you should not have any problems.