first one is a 31 spline c-clip style posi , it has a 12 bolt ring gear bolt pattern , it has a #2 casting number and a 248 date code , , asking $250 , next one is a #761 casting number , it is a 31 spline bolt in style axle , it has a 2:73 ring and pinion with it , it uses a S pring for the clutch preload and uses the square tang style clutches , asking $350 , next one is a 17-2 posi it has the 12 bolt ring gear pattern and is a c-clip style axle retention , asking $250 , all prices do not include shipping that is to be paid by the purchaser . Thanks Bob Shipping would be from zip 60034 .