Thanks a lot Charlie. I just don't understand why everyone shows only a kit for 7.5 g body with 3 bolt flange when are rear is the same as the flange housing is. When I put in 8.5. Rear end they all show early year 4 bolt flange housings. I wonder if anybody understands That Gn is a 8.5 3 bolt housingI had to do a little research and found that the stock axle for both the 8.5" and the 7.5" use the same bearing and have the same overall legnth (28 & 7/16"). I also did the LS1 rear disc upgrade on the axle. Everything I read so far ahas indicated that the actual flange you're talking about is the same diameter. I'll try and measure the axle flange on my car and see how big it is so there's actual proof.