PML Rear Differential Cover for GM /Chevy Products with Torsen Differential, 10 Bolt- Cast Aluminum Finish This cover provides greater oil capacity (.5 qt) over the stock cover for cooler running temperatures. 3/16 inch thick wall construction adds strength to the differential housing Sand Cast Aluminum Construction with Raised Fins to dissipate heat Machined gasket surface for a secure seal using RTV or factory reusable gasket Oil changes without removing the cover.