COPO 12 Bolt Posi Carrier....

[69L72RS]

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

[Fast67VelleN2O]

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

[69L72RS]

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

[Fast67VelleN2O]

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

[69L72RS]

Glad to help.

[Charley Lillard]

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.

[SSRSBOB]

MacNeish wrote a whole chapter on this 234 COPO unit in his Camaro book. Lots of photos. Me and my boys have been to his shop and he's been doing rears for over 40 years!

bob