I wasnt really sure what gears I had in the rear end, but, just by turning the tire and counting the drive shaft revolutions I was guessing it was a 5.38. When we got the gears out and counted the teeth it turns out I had 5.57's! I took the car out for a test drive after we installed the 4.10's and it felt weird, like I was starting out in third gear! Now when I stab the throttle, instead of burning the tires I'm planting the horespower without all that wheel speed! This is gonna take some getting used to and I can drive on the freeway now without turning 4 grand at 60mph!:yes: Woohoo!