The rear one is a bit more work than the front but no great drama. The gasket between the speedo drive housing and the case affects center diff bearing preload so measure the gasket thickness and refit the same thickness. Aftermarket gasket sets are often different thickness so beware. When I rebuilt my box I made my own from suitable thickness gasket paper.
If you are pulling both housings off you might as well pull the center diff and check the spider gear washers in that while you're at it.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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