Thanks alot Jim....
so that narrows it down...
...it could be anything from a 4.10 posi to a 2.56 open rear for basically all applications?????????
Actually what came in the box was an NOS COPO 234 posi unit, correct for a 69 Camaro or Chevelle believe it or not...I've had this part for years and was a bit worried when I recently noticed the part number on the box itself...but I have confirmation that the part itself is correct...(Thank Goodness)...apparently not the original box....