how to look for a salvage yard rear posi?

[bolly]

guys in scrapyards know all about posi's no matter what car they come in.... unlikely to get any kinda deal.... but anythings posssible I guess

[dbradley]

'68-'72 Chevelle or El Camino. The 'other' A bodies are different.

OR

You can install one of these. (I have one in my '33)

http://www.4wheelers.com/powertrax-lockright-c-117.html