Oh, I thought he wanted to know what the little screw going into the diff cover was for. Also, I think they counter sunk the holes to make sure the stock bolts will fit. I know, at least with my cover, the beefy welds may have gotten in the way if they didnt counter sink.
but what do the Studs do on the left and right of the Trick Flow sign??
That is a more than just a cover - it is also a differential girdle. When adjusted properly, the load bolts help stabilize the differential bearing caps when they are under high load. Can help prevent R&P wear or failure.
yea those are actually studs that go through the cover and torque down on the bearing caps to help distribute the forces of the pinion on the ring gear through the entire cover instead of just on the bearing caps alone.