what rear end do i have?

[staggerd86c-10]

I cant remember what rear end my truck has but when i bought my auburn it was a PITA, the reason i'm asking is because i have one of those crappy chrome covers, that everyone tells me that are known for leaking, and i want to remove it and put a new gasket and put it back on and try to stop the leak. What are your guy experience with these diff covers? whats the best way to keep it from leaking? I was planning on putting the gasket sandwiched in with silicone on both sides.