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5126 is for a 489 case. 7126 is for the 742 case. It's in the tech archives under rear axle. Without the pinion nut on I'm sure you will have play until it is socked down. Did the rear have any strange sounds?

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Just got back from Car Quest and the part number is actually
"7216" for the 742 case,
"8515" for the 741 case
"5126" for the 489 case.
numbers come from the rock auto site except,
they do not show the 489 for my application,
as it was not avalable in 68 yet.
A good place to shop
Just an F.Y.I.