66 cuda rebuild

hey guys thanks, puttin some new pics up on my thread in new posts. appreciate the help, can anyone id the rear end, 51 in. backing plate to plate, 8 bolts on the cover. when i turn the yoke, both axles turn in the same direction, but if i hold one tight, the other one will turn (limited slip?) pics of the axle on my rebuild post, thanks again, time to pull the bars and k frame. wow its a hot afternood in southern Texas!!
here is my other post http://www.forabodiesonly.com/mopar/showthread.php?t=99755