Explorer rear axle tag?? Is it a posi?

PickupMan said:

I picked up a rear for the stang and not sure if it's a posi or not. It's from an explorer. I was told it came from an 98 and had 4:10 gears but after I looked at the tag it has 3:55 in it. Not a bad thing but would like to know if it's posi. Here is what the tag says.

S612B
3-55 88 7L26


If anyone knows if it is please let me know.

Thanks!!

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