Rear gear help?

Hello FABO I have a 68 Dart that I found a 8.25 complete axle for.it has a sure grip all set to go supposedly. But the gentleman tells me that the sure grip is very tight. The tires will barley turn by hand. He saying this like its wonderful .That its been assembled so well that it just barely turns. I'm concerned shouldn't the wheels at the outside freely turn with hardly any effort.? Or am I wrong and the idea of it being very snug indicates a job well done.? Any help would be appreciated