Description: Center Differential. Differential (RR). 4.444. G/R=4.444. Device connecting Drive Shaft to Axle Shafts that allows for varied Speeds of Wheel rotation. Fits Crosstrek, Forester, Impreza, Legacy, Outback Differential If you???re hearing gear whine, clunking, or bearing noise From your Rear differential, it may be necessary to remove it and have it rebuilt. Have our technicians examine your Subaru to determine the best course of action.