We opted to fit our Bronco’s rear differential with an Eaton Posi, which combines carbon friction discs with precision-forged gears to give great traction with smooth, quiet performance on the road and on the trails. It’s an inexpensive traction enhancer and easily rebuildable down the road. A trick that differential rebuilders like Johnson use to get a new ring gar on the carrier is to heat the gear up to about 225 degrees on a hot plate. The hot gear (wear heat-resistant gloves!) dropped right into place when we utilized this method.