I have a 2006 Yukon Denali. I have seen a bunch of conflicting info on the Denali AWD systems. I was originally under the impression that they do not have a true AWD. It is basically two "one wheel wonder" axles tied together by a transfer case that does the "slipping" But I have seen claims that the rear diff is actually a limited slip G80. The RPOs on the glove box tag do not list G80. I'm curious because I was wondering if they did not have rear limited slip, would there be an advantage to finding a G80 and putting it in? If so, would I just look for a 3:73 G80 with disc brakes from a similar year Yukon or Suburban? Are there even disadvantages to doing this?