4Runner; 2WD. 4Runner; 4WD; w/o Locking Differential. A Housing separate from the Differential Housing to which the Differential Carrier is mounted to. Differential Carrier. Exc.Differential Lock. The Housing of a Differential that holds the gears, pinions, Differential case, etc. SUB - Assembly, DI. Axle. CASE. GEAR. Included with: Differential Carrier.