Rear diff rebuild process question

[Res731]

I've read all the Tom Endy procedures but I have a question as to why you have to make sure the carrier locks up as the first step. Why can't you just start with the gaskets installed and check for the torque on the carrier. If you set it up and can get the correct drag on the carrier bearings by shifting gaskets, wouldn't that be sufficient?

Curious to the purpose of having to lock it up first.

Rudy