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Chek thr msnual and parts book.
The 55-56 service manual only covers the new Dana rear axle for 56 - nothing on the TT diff. I'd bet that this was because of TT's late introduction in production.
The site's Service Index shows that preliminary info on the TT diff was later provided in a newsletter, which advises that this particular differential was only serviced as an assembly. While that article goes on to direct the reader to a bulletin for additional information for service, that document doesn't provide any internal details, but only the P/Ns for service assemblies. That's all the 55-56 parts book shows for the TT diff (listed as 'Power Lock'), as well.
The 57 Clipper shop manual supplement and 57-58 parts book take the same position on service. Although a Studebaker service bulletin from 57 offers an exploded view, this is for a second design (with disc-type clutches) - NOT the same as the 56 unit (with cone-type clutched. However, I haven't found any details on disassembly and reassembly for even that unit.
Gotta wonder if Dana had some sort of internal documentation that at least covered details of assembly for the original version, if not overhaul.
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