What posi is this?

[ham1974]

They are held in with C clips just like Eatons or aftermarket Auburns. The only thing different is the differential itself per the illustrated parts book.

I looked up the date of the sale of Auburn Gear from Borg-Warner and I was confused. It was in 1982, so 1983-85 Borg Warners could technically be called "Auburns", but the GM literature didn't change because they still called them "Borg-Warner" as late as 1990 in the manual updates. The Cone style clutch is a Borg-Warner design/patent going way back to the mid 60's and Borg-Warner sold tons of them to MOPAR for 8 3/4's.

I don't know what a 10 bolt WD is. The Spring retainer plates in the OP picture have the same semicircular cutouts, one side case window and 2 piece case as the ones in the GM illustrated parts book, so it looks pretty Borg-Warnery.

What year rear would this be? It has disk brakes with iron calipers. What spline 26?

 

[UNGN]

most likely 82-85. probably 26 spline. Later F's would have Eatons.

 

[fleming442]

Either way, it should be inspected before use. I got excited, and then found a cracked side gear. A blessing in disguise- it may have worked for a minute, then imploded, leaving me heartbroken. Or, I could have put it in and it not worked with the same results.