[davided]

Hi

I just picked up a 71 firebird with 10 bolt posi (at least i think). If i spin rear tires forwards they both move. If I spin backwards then forwards the rear end make a racheting type noise and the tires do not spin then it "catches" up and both tires spin.
Is this 'normal'?

Second question - when I removed rear differential had no fluid in it - the ring and pinion where nice and clean the posi case? had a little surface rust -i added fluid, what is the chances this rear end is ok?

thanks in advance for assistance.