741 open to 489 suregrip swap

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Dana67Dart said

My understanding is that the thrust button doesn't allow the axels to seat properly when using green bearings hence the need to remove it when using green bearings. Perhaps I don't understand the issue correctly? (not flaming anyone I just want to be clear on the issue)

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The problem with that theory would be that the open units and the later cone type rears do not have removable thrust blocks so that IF that were the case, you would not be able to use them with green bearings. I do not think this is the case. The thrust block IS necessary when running stock axles and a clutch style sure grip. The quickest
way to check if the thrust pin is in place is to look into the center section and make certain that you cannot see daylight coming in from the other side.