How much play should there be in a sure grip back and forth?

Hey all
I have a question about the play in a 8 3/4 323 sure grip rear end? When I put the car up on jack stands and grab the drive shaft and turn it; it takes about 3/4 of a inch turn before it turns the wheels either way. My question is this to much play from side to side? and can this play be adjusted? I hope this makes sense. I switched from a auto 727 to a four speed this winter and never noticed any problems before.

Pat Faley
"fuzzman"
67 NB S Clone
Peoria IL