This is the Stock Replacement Gear Diff Case for the HPI Sprint RTR.
This is located in the front and rear of the vehicle.
Black plastic construction
One gear diff case
Two 5x8mm brass bushings
Four 2x14mm round head self-tapping screws
The remainder of the diff components.
Case length: 39mm (1.54")
Case tooth diameter: 29.7mm (1.17")