GM 10-bolt Differential carrier for ring gear made for chevy cars and trucks. it fits inside the rear differential .the axles slide into it and drives the spider gears driven by the spider gears that are driven by the ring gear that is driven by the pinon gear that is attached to the drive shaft of the vehicle your spider and ring gear are missing and there is no way to tell exactly how old the item is.

GM 10-bolt Differential carrier for ring gear

References:

http://www.ebay.com/sch/i.html?_odkw=10+bolt+posi+carrier&_osacat=0&_from=R40...

https://images.search.yahoo.com/yhs/search;_ylt=A0LEVibdwgJWdbMAiv4nnIlQ?p=gm...

Reason:
I need to specifically know what this is, what it goes to, how old it is, what it is used for and who manufactures it. Thanks.

GM 10-bolt Differential carrier for ring gear made for chevy cars and trucks. it fits inside the rear differential .the axles slide into it and drives the spider gears driven by the spider gears that are driven by the ring gear that is driven by the pinon gear that is attached to the drive shaft of the vehicle your spider and ring gear are missing and there is no way to tell exactly how old the item is.

References:

http://www.hemmings.com/hmn/stories/2009/03/01/hmn_feature29.html