COPO 12 Bolt Posi Carrier....
 

How do I know for sure that I have one? I have tried using the search function on this website... but haven't found any hardcore evidence. Seems like the guys who know these things want to keep them under wraps.
-Matt

Re: COPO 12 Bolt Posi Carrier....
 

Forgot to mention that the unit in question is a small window 174 carrier.

Re: COPO 12 Bolt Posi Carrier....
 

Ping Eric he is the king of posi's, 69L72RS

Re: COPO 12 Bolt Posi Carrier....
 

Post a pic of it here - with Eric's help he will be able to indentify from just a few photos.

Re: COPO 12 Bolt Posi Carrier....
 

Hi Matt,
Post a picture or email me one of the internal parts thru the large case window.
I should be able to tell from that.
Eric

Re: COPO 12 Bolt Posi Carrier....
 

Here we go guys. Just got time to snap a few photos and post them here. What do you think?

http://i373.photobucket.com/albums/o...o/IMG_8091.jpg
http://i373.photobucket.com/albums/o...o/IMG_8092.jpg
http://i373.photobucket.com/albums/o...o/IMG_8093.jpg
http://i373.photobucket.com/albums/o...o/IMG_8094.jpg

Re: COPO 12 Bolt Posi Carrier....
 

That is a standard 4-series posi unit.
The spring plate have the obround holes for the c-clips.
The axle gears look like they are the 17 tooth gears, because they have flat tips and the teeth roots are too high above the clutch packs.
The B-7-J would be the assembly date of February 7th 1969.
That would be a good unit for a late February or March assembled BV or KK rear end.
Hope this helps.
Eric

Re: COPO 12 Bolt Posi Carrier....
 

Ahhh... One of these days I hope to snag one! Thanks for the ID Eric!
-Matt

Re: COPO 12 Bolt Posi Carrier....
 

Glad to help.

Re: COPO 12 Bolt Posi Carrier....
 

The copo posi unit uses standard non posi sized spider gears. They are smaller than traditional posi spiders so they can match up with the larger copo axle gears. Hard to explain with only one cup of coffee.