Bought a 12 bolt posi carrier that looks like new, plates and gears both, but it has only 28 splines for the axles. Pinion gear shaft measures the same as car not truck diameter. Is it an old style "O" for early vehicles or what
Couldn't use it, would like to be able to ID it so I can sell it to someone who CAN use it. Any help greatly appreciated.

 

Here's also a pic of the casting numbers if that'll help...

 

A Type O only uses 10 bolts on the ring gear.

 

I copied this post to the Drivetrain/Differentials forum. Hopefully monzaz will see it and answer your question.