Dear Owen F.,
Hope you're well and stay so!! I cannot recall a post reporting the problem You describe. The FAQs cover many subjects. But there's nothing as to work inside a rear end (final drive).
These units - mainly made by Dana Corporation - seem very robust, at least if the lube oil is changed about once a decade.
See if you can find Volvo Service Manual TP31685/1. This deals with the rear axle. For a .pdf version, see: https://www.ebid.net/us/for-sale/volvo-700-940-960-rear-axle-service-manual-1991-tp31685-1-pdf-217613843.htm?srsltid=AfmBOoqr2cYHVk5JefzOFkiYxW6RknBKee-Wvgg6xwz9RHUWQ4nltgnF
I wish I could be of more help.
Yours faithfully,
Spook
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