Okay four broken diff's later and no factory warranty on number 3 or 4, I have to find a fix. I broke my last diff about two weeks ago along with the drive shaft and both axles (half shafts)........who wants to know what the parts bill was? I have been running the KARS III kit and it has helped minimize the hop but not eliminate it all together, Well I bought a new carrier and put the KARS kit on minus the carrier bracket (due to the instant whine) put UUC diff bushing in and I believe I cured the hop all together but not with the KARS kit or the bushing. I had custom half shafts made which was GM's fix for the 2009. I'm not sure anyone has figured this out yet. Used was a larger diameter shaft on the left side. These axles use bigger stronger 108mm cv with chromoly cage and race set. The axles are designed to twist at different rates thus reducing the stress on the rear diff and completely eliminating wheel hop. I will put this new product to the test and keep everyone updated. The half shafts are a direct bolt in and swap right in with no other mods. The same design is used by Underground Racing on there world record setting Viper and will support over 1000hp. Kit will run $1800 which is about $200 more than replacing the factory axles from Cadillac, and if we can get together a group buy of 5 sets or more I'm sure we will get a significant discount.