The G-80 3.42 9.5" 14 bolt in my GMC is holding up fine. But my 60' times suuuuuuuuuck! What is a better locker/diff option for the 14 bolt (I'm swapping to 4.11's)? The Eaton Truetrac, Eaton locker, Yukon? I beat the ever-loving snot outta my truck and the G-80 hasn't failed to lockup yet, but when it unlocks in the burnout box you see people jump looking for flying debris

 

Detroit gets my vote. I've only ever seen one broken. Ever. It was in a truck on 49's, in a rear steer 14 bolt, with a supercharged SBC, thousands of pounds of stereo equipment, and a crazy owner that drove it like an absolute hooligan.