Thanks to [MENTION=147235]Renegade_Medic[/MENTION]Renegade_Medic for all the help on this one.
I had a horrible grinding sound coming from the rear end. Initially thought it was the back brakes. After swapping out the old brakes and dropping in new ones. Sound continued. While it was on the jacks we identified that it was a bad third member. Off to the junk yard we went and were able to recover a rear axle with a 3.73 vs. my 4.10. While the rear end was out we dropped in new springs and shocks to get rid of the rear sag. Daily driver so just did stock replacement on a budget. The swap ended up taking a couple hours but now the ride is smooth, no more rear end sag and feels so much better.