This is the Sierra 4x4 positraction differential. The limited slip unit is inside of the differential and is a sealed unit that can not be worked on. The posi rear uses regular 75W-90 gear oil.

Two Sierra 4x4 Posi diffs.
The spacer that you need to put the posi into a Merkur.
This is the rear differential mount.
This is the marking on a 4x4 differential.
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