I Want To Put A Posi Rear End In My 83 Z But I Can't Afford A New One. I Was Told One Out Of An 87-92 350 Tpi Car Will Bolt Right Up And Is A Lot Stronger Than The One I Have. Is This True? Are They All Posi's? What Gears Were Used On These Rear Ends, Or Are There Many Of Them? What Is A Fair Price To Pay For One? All Help Is Greatly Appreciated! Thanks!