1st post. Thanks for having me on board. Just drove my truck off the lot today. So far I'm very impressed. I had better love it... Anyways. As I figure out what these parts are actually, the first question I had had/have is identifying the exact manufacturer and technology used in the rear end. I know it's a 12" AAM, similar to the 11.5" used in previous models including GM 3500. I loved the G80 in my last 2 GM 3500 11.5 AAM. But I don't think my truck uses the G80. I believe it uses a Torsen clutchless LSD. Some folks dont like it as much as the G80 locker but others prefer it. Regardless, if anybody has any info on exactly what in the pig back there, please chime in.