Rear axle problem?

["WC Roddick" <roscoe1@xxxxxxxxxxxxxx>]

Our '64 has an 8.75" sure grip differential.  I have the car on jack stands and the drive shaft removed.  When I rotate the rear wheels I get almost instant movement of the pinion flange, but when I rotate the pinion flange there is much more "slack" before the wheels begin to turn.  It seems to me that the amount of "slack" should be the same regardless of which "end" I am rotating.   Is this behavior normal for the sure grip rear-end, or do we have a problem?

 

I am trying to find the source of a "clunk" in the driveline, when I shift out of neutral into reverse or a forward gear.  The "clunk" is kinda loud, and has a sort of bell ring sound to it.  The front U-joint is a bit lose, but side-to-side not rotational, as though the ends of the "cross" were worn.  I will replace it anyway.  Also sent the center support bearing insulator to the Damper Doctor for rebuild.  The rubber was intact, but sagging due the car sitting idle for 12 years. 

 

Any advice?

 

Thanks.

Bill & Tami

'64 Crown