How to tell if i have a sure grip center??

Just curious if there is any way to find out what i have before i install it. When i bought it years ago i was told it was 3:55gears and suregrip.

Is there any way to make sure? And if so how do i tell if it is a clutch or cone type? Do they both take the same gear lube?

Any way to make sure i have 3:55 gears before i put it in there?

I ordered new bearings today so I just thought i would try to find out what i have since i cant really just install it and find out what gear ratio by turning the driveshaft/tires. It is stamped 2881489 with a triangle next to the numbers. Above the numbers is a number 2 and below is a small casting of 82. It also has a large 6 cast on the side of it. Not sure if any of this matters at all.