Automotive Differential Step 2 - Inside the differential is a ring gear which is driven by a pinion gear (not in view.) This particular differential is equipped with a locker, which can sense wheel slip to couple the spider gears forcing both drive wheels to work as one.
Ring Gear and Locker Step 3 - A pinion shaft is used to hold the spider gears in place while positioning each axle as to hold a retainer clip in place.
Spider Gears Step 5 - Some differentials are designed with an axle retainer clip which is used to hold the axle in place.
Axle Retainer Clip