I dropped my coil overs about 3/8-1/2" all the way around, leaving about a 1 inch gap between the front tire and fender arch and about a 2 inch gap in the rear, yet the frame is lower in the rear, about 6 inches, whereas the front is 6 1/2" from the ground.
Oil pan is about 4" from the ground. I'm running 15" tires.