All 78-87 G bodies interchange rears as far as I know.As for posi it may or maynot be,posi was an option.Pull the cover take a look.Or jack it up and turn a wheel the other side should turn the oposite way.It should have either a 3.42 or 3.73 ratio though.
thanks for the replies, either way posi r not its a lot lower gear so im a put it behind the 455, waiting on tranny adapter to bolt chevy tranny to olds motor.
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