Yeah, 2.5" is a lot. To make that much work you would have to do a full mini tub. But 1.5" shouldn't be too bad though.thanks Dave, I took off 245 x 45 x 17"s on 9" wide rims and with the car being lowered 2.5" they would rub the bottom of the wheel well on a big dump.
Remember to measure for the proper backspacing on your vehicle, once you have that, at least you know what to look for in a new wheel.