John, do you have a copy of the Chev Maintenance Manual MB-C1? There is some interesting info there regarding the C15 differential that might surprise you.
For other 4x4 CMPs there was a locking differential made by Thornton-Welles that was listed in the parts books as "Optional", but I haven't found any reference to which applications of CMP truck required this option, and certainly haven't seen any surviving units of the Thornton-Welles locker.
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