2013-2016. CODE KBU OR KRR. Difrntal assy. from 01/28/2013. Rear. A single complete drive axle assembly, used on vehicles that utilize dependent suspension systems, that includes a differential and drive axles to deliver power to the wheels of a vehicle in order to drive the vehicle. Device connecting Drive Shaft to Axle Shafts that allows for varied speeds of wheel rotation. Differential Code KRR. From 01/28/2013. The housing of a differential that holds the gears, pinions, differential case, etc. DIFFERENTIAL. DIFFERENTIAL ASSEMBLY. DIFFERENTIAL carrier. Differential Housing. Drive Axle Assembly.