Maybe this can get you started anyways.
The early 850s had the M56L manual tranny, later cars, perhaps not until the S/V70 came along, they started using the M56H. According to this: http://volvospeed.com/vs_forum/index.php?showtopic=72859 there's not much difference between the two in the way of gear ratios.
Final drives may even be available from sources other than Volvo (Quaife). For some good pictures of a diff replacement see: http://volvospeed.com/vs_forum/index.php?showtopic=64440 .
I've gotten up to 31MPG on a single tank in my '95 5-speed. I usually get 22city/26highway but I'm not one to spare the whip.
--Will
850 / Mini
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