[Fot] GT6 differential and general question

[Scott Janzen]

After disassembling a spare diff, bead blasting it, replacing pinion bearings and seals, carefully setting up the gear lash , etc, I torqued the bearing cap bolts on the differential carrier for the last time, and one of the holes  stripped.
I can put a helicoil in, but in the process I will loose the steel locating sleeve on this bolt hole that helps locate the cap.  

I can’t remove the sleeve without destroying it.  Several questions:

What’s the correct name for these “sleeves”, if I want to try to get one from McMaster Carr, or where can I get them?

Are they essential or can I get buy without it?  I assume these are there because they take some side thrust from the carrier, which otherwise is resisted only by clamping force and the bolt shoulder.

I could start over with another diff casing - maybe the best thing to do.  Just hate to have to strip and clean another one up, press out pinion bearings, replace seals, adjust the bleepety-bleep gear lash all over again!

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