A rear end gear box cover for a racing car is formed with a fixed base plate and a removable top plate. The base plate is fixed to the rear end housing by multiple fasteners while the top plate is removable from the base plate. The top plate includes a pair of opposing cam members carrying connector pins for engagement with receiver mounts formed on the base plate. A cam driver on the top plate has a central connector member that when rotated drives a pair of opposing cam pins carried in a slotted opening on the cam members outwardly to force the connector pins into openings in the receiver mounts and secure the top plate to the base plate. A detent mechanism in each of the slotted openings retains the cam members in a locked position. A quarter turn of the connector member retracts the connector pins.