I just picked my car up yesterday from the shop, since the Posi went bad in a matter of 2 months they swapped it out with a new one and at the same time I had them pull the 4.10's out and add 4.30's... But remember I don't have an IRS, its a build 8.8 with Moser 31 spline axles, 3in ARP extended studs, Eaton posi.
All I have to say is running 9 PSI off the Vortech and the 4.30 gears, it feels like a new car again. Now when people say GO WITH 4.30's I now know why!!!!!!
http://i25.photobucket.com/albums/c6...9/IMG_1017.jpg